diff --git a/app/src/main/java/pl/lebihan/authnkey/AuthnkeyError.kt b/app/src/main/java/pl/lebihan/authnkey/AuthnkeyError.kt
new file mode 100644
index 0000000..108811e
--- /dev/null
+++ b/app/src/main/java/pl/lebihan/authnkey/AuthnkeyError.kt
@@ -0,0 +1,17 @@
+package pl.lebihan.authnkey
+
+sealed class AuthnkeyError(message: String) : Exception(message) {
+    // Connection errors
+    class NotIsoDepTag : AuthnkeyError("Not an ISO-DEP tag")
+    class FidoAppletNotFound : AuthnkeyError("FIDO applet not found")
+    class ConnectionFailed : AuthnkeyError("Connection failed")
+    class NotConnected : AuthnkeyError("Not connected")
+
+    // PIN protocol errors
+    class PinProtocolNotInitialized : AuthnkeyError("PIN protocol not initialized")
+    class PinProtocolInitFailed : AuthnkeyError("PIN protocol initialization failed")
+
+    // Authentication errors
+    class UserVerificationRequiredNoPin : AuthnkeyError("User verification required but no PIN set")
+    class PinBlocked : AuthnkeyError("PIN is blocked")
+}
diff --git a/app/src/main/java/pl/lebihan/authnkey/CredentialProviderActivity.kt b/app/src/main/java/pl/lebihan/authnkey/CredentialProviderActivity.kt
index 73861ed..f7fb8f8 100644
--- a/app/src/main/java/pl/lebihan/authnkey/CredentialProviderActivity.kt
+++ b/app/src/main/java/pl/lebihan/authnkey/CredentialProviderActivity.kt
@@ -10,6 +10,7 @@ import android.hardware.usb.UsbDevice
 import android.hardware.usb.UsbManager
 import android.nfc.NfcAdapter
 import android.nfc.Tag
+import android.nfc.TagLostException
 import android.nfc.tech.IsoDep
 import android.os.Build
 import android.os.Bundle
@@ -369,11 +370,11 @@ class CredentialProviderActivity : AppCompatActivity() {
                 bottomSheet?.getCurrentPinIfValid()?.let { pendingPin = it }
                 bottomSheet?.showPinInput(false)
 
-                val isoDep = IsoDep.get(tag) ?: throw Exception("Not an ISO-DEP tag")
+                val isoDep = IsoDep.get(tag) ?: throw AuthnkeyError.NotIsoDepTag()
                 val transport = NfcTransport(isoDep)
 
                 if (!transport.selectFidoApplet()) {
-                    throw Exception("Failed to select FIDO applet")
+                    throw AuthnkeyError.FidoAppletNotFound()
                 }
 
                 currentTransport = transport
@@ -387,7 +388,7 @@ class CredentialProviderActivity : AppCompatActivity() {
 
             } catch (e: Exception) {
                 Log.e(TAG, "NFC error", e)
-                setInstruction(getString(R.string.error_retry_format, e.message ?: "Unknown error"))
+                setInstruction(getString(R.string.error_retry_format, e.toUserMessage(this@CredentialProviderActivity)))
                 setState(CredentialBottomSheet.State.ERROR)
                 showProgress(false)
             }
@@ -408,7 +409,7 @@ class CredentialProviderActivity : AppCompatActivity() {
 
                 val transport = withContext(Dispatchers.IO) {
                     UsbTransport.create(usbManager, device)
-                } ?: throw Exception("Failed to initialize USB connection")
+                } ?: throw AuthnkeyError.ConnectionFailed()
 
                 currentTransport = transport
                 pinProtocol = PinProtocol(transport)
@@ -420,7 +421,7 @@ class CredentialProviderActivity : AppCompatActivity() {
 
             } catch (e: Exception) {
                 Log.e(TAG, "USB error", e)
-                setInstruction(getString(R.string.error_retry_format, e.message ?: "Unknown error"))
+                setInstruction(getString(R.string.error_retry_format, e.toUserMessage(this@CredentialProviderActivity)))
                 setState(CredentialBottomSheet.State.ERROR)
                 showProgress(false)
             }
@@ -431,8 +432,8 @@ class CredentialProviderActivity : AppCompatActivity() {
         scope.launch {
             try {
                 val json = JSONObject(requestJson!!)
-                val transport = currentTransport ?: throw Exception("No transport")
-                val protocol = pinProtocol ?: throw Exception("No PIN protocol")
+                val transport = currentTransport ?: throw AuthnkeyError.NotConnected()
+                val protocol = pinProtocol ?: throw AuthnkeyError.PinProtocolNotInitialized()
 
                 // Get device info to check PIN requirements and CTAP version
                 val infoResponse = withContext(Dispatchers.IO) {
@@ -452,7 +453,7 @@ class CredentialProviderActivity : AppCompatActivity() {
                     }
                     // UV required but device has no PIN - fail
                     userVerification == UserVerification.REQUIRED && !deviceHasPin -> {
-                        throw Exception(getString(R.string.error_uv_required_no_pin))
+                        throw AuthnkeyError.UserVerificationRequiredNoPin()
                     }
                     // UV required/preferred and device has PIN - need to get PIN
                     userVerification != UserVerification.DISCOURAGED && deviceHasPin -> {
@@ -486,7 +487,7 @@ class CredentialProviderActivity : AppCompatActivity() {
                 if (e.error == CTAP.Error.PIN_REQUIRED ||
                     e.error == CTAP.Error.PIN_AUTH_INVALID) {
                     Log.d(TAG, "Authenticator requires PIN despite UV=discouraged")
-                    val protocol = pinProtocol ?: throw Exception("No PIN protocol")
+                    val protocol = pinProtocol ?: throw AuthnkeyError.PinProtocolNotInitialized()
                     val retries = withContext(Dispatchers.IO) { protocol.getPinRetries() }.getOrDefault(8)
                     showPinDialog(retries, json)
                 } else {
@@ -509,12 +510,12 @@ class CredentialProviderActivity : AppCompatActivity() {
     private fun authenticateAndExecute(pin: String, requestJson: JSONObject) {
         scope.launch {
             try {
-                val protocol = pinProtocol ?: throw Exception("PIN protocol not initialized")
+                val protocol = pinProtocol ?: throw AuthnkeyError.PinProtocolNotInitialized()
 
                 setInstruction(getString(R.string.instruction_initializing))
                 val initialized = withContext(Dispatchers.IO) { protocol.initialize() }
                 if (!initialized) {
-                    throw Exception("Failed to initialize PIN protocol")
+                    throw AuthnkeyError.PinProtocolInitFailed()
                 }
 
                 // Determine permissions and rpId based on operation type
@@ -539,12 +540,12 @@ class CredentialProviderActivity : AppCompatActivity() {
                         if (retries > 0) {
                             runOnUiThread {
                                 showProgress(false)
-                                setInstruction(getString(R.string.pin_invalid_retries, retries))
+                                setInstruction(getString(R.string.pin_incorrect_retries, retries))
                                 setState(CredentialBottomSheet.State.PIN)
                                 bottomSheet?.showPinInput(true)
                             }
                         } else {
-                            throw Exception(getString(R.string.error_pin_blocked))
+                            throw AuthnkeyError.PinBlocked()
                         }
                     } else {
                         throw e
@@ -563,7 +564,7 @@ class CredentialProviderActivity : AppCompatActivity() {
 
     private suspend fun executeRequest(requestJson: JSONObject, pinProtocol: PinProtocol?) {
         try {
-            val transport = currentTransport ?: throw Exception("No transport")
+            val transport = currentTransport ?: throw AuthnkeyError.NotConnected()
 
             if (isCreateRequest) {
                 executeCreateCredential(transport, requestJson, pinProtocol)
@@ -1074,7 +1075,7 @@ class CredentialProviderActivity : AppCompatActivity() {
     private fun handleError(e: Exception) {
         runOnUiThread {
             showProgress(false)
-            setInstruction(getString(R.string.error_format, e.message ?: "Unknown error"))
+            setInstruction(getString(R.string.error_format, e.toUserMessage(this)))
             setState(CredentialBottomSheet.State.ERROR)
         }
     }
diff --git a/app/src/main/java/pl/lebihan/authnkey/ErrorMapping.kt b/app/src/main/java/pl/lebihan/authnkey/ErrorMapping.kt
new file mode 100644
index 0000000..2249a52
--- /dev/null
+++ b/app/src/main/java/pl/lebihan/authnkey/ErrorMapping.kt
@@ -0,0 +1,42 @@
+package pl.lebihan.authnkey
+
+import android.content.Context
+import android.nfc.TagLostException
+
+fun Throwable.toUserMessage(context: Context): String = when (this) {
+    // Android NFC exception
+    is TagLostException -> context.getString(R.string.error_tag_lost)
+
+    // CTAP protocol errors
+    is CTAP.Exception -> this.error.toUserMessage(context)
+
+    // App-specific errors
+    is AuthnkeyError.NotIsoDepTag -> context.getString(R.string.error_not_supported_tag)
+    is AuthnkeyError.FidoAppletNotFound -> context.getString(R.string.error_not_security_key)
+    is AuthnkeyError.ConnectionFailed -> context.getString(R.string.error_connection_failed)
+    is AuthnkeyError.NotConnected -> context.getString(R.string.error_not_connected)
+    is AuthnkeyError.PinProtocolNotInitialized -> context.getString(R.string.error_key_disconnected)
+    is AuthnkeyError.PinProtocolInitFailed -> context.getString(R.string.error_communication_failed)
+    is AuthnkeyError.UserVerificationRequiredNoPin -> context.getString(R.string.error_uv_required_no_pin)
+    is AuthnkeyError.PinBlocked -> context.getString(R.string.error_pin_blocked)
+
+    // Fallback
+    else -> this.message ?: context.getString(R.string.error_unknown)
+}
+
+private fun CTAP.Error.toUserMessage(context: Context): String = when (this) {
+    CTAP.Error.NO_CREDENTIALS -> context.getString(R.string.error_no_credentials)
+    CTAP.Error.PIN_INVALID -> context.getString(R.string.error_pin_incorrect)
+    CTAP.Error.PIN_BLOCKED -> context.getString(R.string.error_pin_blocked)
+    CTAP.Error.PIN_NOT_SET -> context.getString(R.string.error_pin_not_set)
+    CTAP.Error.PIN_AUTH_INVALID -> context.getString(R.string.error_pin_auth_invalid)
+    CTAP.Error.PIN_AUTH_BLOCKED -> context.getString(R.string.error_pin_auth_blocked)
+    CTAP.Error.CREDENTIAL_EXCLUDED -> context.getString(R.string.error_credential_excluded)
+    CTAP.Error.OPERATION_DENIED -> context.getString(R.string.error_operation_denied)
+    CTAP.Error.USER_ACTION_TIMEOUT -> context.getString(R.string.error_user_action_timeout)
+    CTAP.Error.TIMEOUT -> context.getString(R.string.error_timeout)
+    CTAP.Error.KEY_STORE_FULL -> context.getString(R.string.error_key_store_full)
+    CTAP.Error.UNSUPPORTED_ALGORITHM -> context.getString(R.string.error_unsupported_algorithm)
+    CTAP.Error.KEEPALIVE_CANCEL -> context.getString(R.string.error_operation_cancelled)
+    else -> context.getString(R.string.error_ctap_unknown, this.name)
+}
diff --git a/app/src/main/java/pl/lebihan/authnkey/MainActivity.kt b/app/src/main/java/pl/lebihan/authnkey/MainActivity.kt
index f39d948..05e0b40 100644
--- a/app/src/main/java/pl/lebihan/authnkey/MainActivity.kt
+++ b/app/src/main/java/pl/lebihan/authnkey/MainActivity.kt
@@ -11,6 +11,7 @@ import android.hardware.usb.UsbDevice
 import android.hardware.usb.UsbManager
 import android.nfc.NfcAdapter
 import android.nfc.Tag
+import android.nfc.TagLostException
 import android.nfc.tech.IsoDep
 import android.os.Build
 import android.os.Bundle
@@ -185,11 +186,11 @@ class MainActivity : AppCompatActivity() {
                 currentTransport?.close()
                 currentTransport = null
 
-                val isoDep = IsoDep.get(tag) ?: throw Exception("Not an ISO-DEP tag")
+                val isoDep = IsoDep.get(tag) ?: throw AuthnkeyError.NotIsoDepTag()
                 val transport = NfcTransport(isoDep)
 
                 if (!transport.selectFidoApplet()) {
-                    throw Exception("Failed to select FIDO applet")
+                    throw AuthnkeyError.FidoAppletNotFound()
                 }
 
                 currentTransport = transport
@@ -216,7 +217,7 @@ class MainActivity : AppCompatActivity() {
                 }
 
             } catch (e: Exception) {
-                statusText.text = getString(R.string.nfc_error, e.message ?: "")
+                statusText.text = getString(R.string.nfc_error, e.toUserMessage(this@MainActivity))
                 updateConnectionStatus()
             }
         }
@@ -299,7 +300,7 @@ class MainActivity : AppCompatActivity() {
 
                 val transport = withContext(Dispatchers.IO) {
                     UsbTransport.create(usbManager, device)
-                } ?: throw Exception("Failed to initialize FIDO communication")
+                } ?: throw AuthnkeyError.ConnectionFailed()
 
                 currentTransport = transport
                 pinProtocol = PinProtocol(transport)
@@ -309,7 +310,7 @@ class MainActivity : AppCompatActivity() {
                 statusText.text = getString(R.string.usb_connected)
 
             } catch (e: Exception) {
-                statusText.text = getString(R.string.usb_error, e.message ?: "")
+                statusText.text = getString(R.string.usb_error, e.toUserMessage(this@MainActivity))
                 updateConnectionStatus()
             }
         }
@@ -362,7 +363,7 @@ class MainActivity : AppCompatActivity() {
 
         scope.launch {
             try {
-                val transport = currentTransport ?: throw Exception("No key connected")
+                val transport = currentTransport ?: throw AuthnkeyError.NotConnected()
 
                 resultText.text = getString(R.string.reading_device_info)
 
@@ -389,7 +390,7 @@ class MainActivity : AppCompatActivity() {
                 if (isNfcDisconnected()) {
                     showNfcReconnectDialog()
                 } else {
-                    resultText.text = getString(R.string.error_generic, e.message ?: "")
+                    resultText.text = e.toUserMessage(this@MainActivity)
                     pendingAction = null
                     handleDisconnect()
                 }
@@ -402,7 +403,7 @@ class MainActivity : AppCompatActivity() {
 
         scope.launch {
             try {
-                val transport = currentTransport ?: throw Exception("No key connected")
+                val transport = currentTransport ?: throw AuthnkeyError.NotConnected()
 
                 resultText.text = getString(R.string.checking_cred_mgmt)
 
@@ -426,7 +427,7 @@ class MainActivity : AppCompatActivity() {
                     return@launch
                 }
 
-                val protocol = pinProtocol ?: throw Exception("PIN protocol not initialized")
+                val protocol = pinProtocol ?: throw AuthnkeyError.PinProtocolNotInitialized()
                 val retries = withContext(Dispatchers.IO) { protocol.getPinRetries() }.getOrElse { e ->
                     if (e is java.io.IOException) throw e
                     resultText.text = getString(R.string.error_could_not_get_pin_status)
@@ -448,7 +449,7 @@ class MainActivity : AppCompatActivity() {
                 if (isNfcDisconnected()) {
                     showNfcReconnectDialog()
                 } else {
-                    resultText.text = getString(R.string.error_generic, e.message ?: "")
+                    resultText.text = e.toUserMessage(this@MainActivity)
                     pendingAction = null
                     handleDisconnect()
                 }
@@ -486,8 +487,8 @@ class MainActivity : AppCompatActivity() {
 
         scope.launch {
             try {
-                val transport = currentTransport ?: throw Exception("No key connected")
-                val protocol = pinProtocol ?: throw Exception("PIN protocol not initialized")
+                val transport = currentTransport ?: throw AuthnkeyError.NotConnected()
+                val protocol = pinProtocol ?: throw AuthnkeyError.PinProtocolNotInitialized()
 
                 resultText.text = getString(R.string.authenticating)
 
@@ -507,18 +508,8 @@ class MainActivity : AppCompatActivity() {
                     if (usePreviewCommand) protocol.requestPinToken(pin)
                     else protocol.requestPinToken(pin, PinProtocol.PERMISSION_CM)
                 }.onFailure { e ->
-                    when {
-                        e is java.io.IOException -> throw e
-                        e is CTAP.Exception && e.error == CTAP.Error.PIN_INVALID -> {
-                            resultText.text = getString(R.string.error_invalid_pin)
-                        }
-                        e is CTAP.Exception && e.error == CTAP.Error.PIN_BLOCKED -> {
-                            resultText.text = getString(R.string.error_pin_blocked)
-                        }
-                        else -> {
-                            resultText.text = getString(R.string.error_generic, e.message ?: "")
-                        }
-                    }
+                    if (e is java.io.IOException) throw e
+                    resultText.text = e.toUserMessage(this@MainActivity)
                     pendingAction = null
                     return@launch
                 }
@@ -533,7 +524,7 @@ class MainActivity : AppCompatActivity() {
                     if (isNfcDisconnected()) {
                         showNfcReconnectDialog()
                     } else {
-                        resultText.text = getString(R.string.error_metadata, it.message ?: "")
+                        resultText.text = getString(R.string.error_metadata, it.toUserMessage(this@MainActivity))
                         pendingAction = null
                     }
                     return@launch
@@ -555,7 +546,7 @@ class MainActivity : AppCompatActivity() {
                     if (isNfcDisconnected()) {
                         showNfcReconnectDialog()
                     } else {
-                        resultText.text = outputFormatter.formatEnumerateRpsError(metadata, it.message ?: "")
+                        resultText.text = outputFormatter.formatEnumerateRpsError(metadata, it.toUserMessage(this@MainActivity))
                         pendingAction = null
                     }
                     return@launch
@@ -586,7 +577,7 @@ class MainActivity : AppCompatActivity() {
                             OutputFormatter.RelyingPartyWithCredentials(
                                 relyingParty = rp,
                                 credentials = null,
-                                error = credsResult.exceptionOrNull()?.message
+                                error = credsResult.exceptionOrNull()?.toUserMessage(this@MainActivity)
                             )
                         )
                     } else {
@@ -614,7 +605,7 @@ class MainActivity : AppCompatActivity() {
                 if (isNfcDisconnected()) {
                     showNfcReconnectDialog()
                 } else {
-                    resultText.text = getString(R.string.error_generic_with_trace, e.message ?: "", e.stackTraceToString())
+                    resultText.text = e.toUserMessage(this@MainActivity)
                     pendingAction = null
                     handleDisconnect()
                 }
@@ -627,7 +618,7 @@ class MainActivity : AppCompatActivity() {
 
         scope.launch {
             try {
-                val protocol = pinProtocol ?: throw Exception("PIN protocol not initialized")
+                val protocol = pinProtocol ?: throw AuthnkeyError.PinProtocolNotInitialized()
 
                 resultText.text = getString(R.string.checking_pin_status)
 
@@ -639,9 +630,9 @@ class MainActivity : AppCompatActivity() {
                 val confirmPinEdit = dialogView.findViewById<EditText>(R.id.confirmPin)
 
                 val message = if (retries != null) {
-                    "PIN retries remaining: $retries"
+                    getString(R.string.pin_retries_status, retries)
                 } else {
-                    "Could not get PIN status"
+                    getString(R.string.error_pin_status)
                 }
 
                 pendingAction = null
@@ -676,7 +667,7 @@ class MainActivity : AppCompatActivity() {
                 if (isNfcDisconnected()) {
                     showNfcReconnectDialog()
                 } else {
-                    resultText.text = getString(R.string.error_generic, e.message ?: "")
+                    resultText.text = e.toUserMessage(this@MainActivity)
                     pendingAction = null
                     handleDisconnect()
                 }
@@ -689,7 +680,7 @@ class MainActivity : AppCompatActivity() {
 
         scope.launch {
             try {
-                val protocol = pinProtocol ?: throw Exception("PIN protocol not initialized")
+                val protocol = pinProtocol ?: throw AuthnkeyError.PinProtocolNotInitialized()
 
                 resultText.text = getString(R.string.initializing_pin_protocol)
 
@@ -730,7 +721,7 @@ class MainActivity : AppCompatActivity() {
                 if (isNfcDisconnected()) {
                     showNfcReconnectDialog()
                 } else {
-                    resultText.text = getString(R.string.error_generic, e.message ?: "")
+                    resultText.text = e.toUserMessage(this@MainActivity)
                     pendingAction = null
                 }
             }
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 265e63c..89ac5b4 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -35,19 +35,43 @@
     <string name="pin_continue">Continue</string>
     <string name="pin_too_short">PIN must be at least 4 characters</string>
     <string name="pin_retries_remaining">Enter PIN (%1$d retries remaining)</string>
-    <string name="pin_invalid_retries">Invalid PIN. %1$d retries remaining</string>
+    <string name="pin_incorrect_retries">Incorrect PIN. %1$d retries remaining</string>
 
     <!-- Errors -->
-    <string name="error_format">Error: %1$s\n\nTry again or cancel</string>
-    <string name="error_retry_format">Error: %1$s\n\nTry again</string>
+    <string name="error_format">%1$s\n\nTry again or cancel</string>
+    <string name="error_retry_format">%1$s\n\nTry again</string>
     <string name="error_user_cancelled">User cancelled</string>
     <string name="error_no_request">No valid request found</string>
     <string name="error_generic">Error: %1$s</string>
     <string name="error_generic_with_trace">Error: %1$s\n\n%2$s</string>
     <string name="error_metadata">Error getting metadata: %1$s</string>
-    <string name="error_could_not_get_pin_status">Error: Could not get PIN status</string>
-    <string name="error_pins_dont_match">Error: New PINs don\'t match</string>
-    <string name="error_uv_required_no_pin">User verification required but no PIN is set on your security key</string>
+    <string name="error_could_not_get_pin_status">Could not get PIN status</string>
+    <string name="error_pins_dont_match">New PINs don\'t match</string>
+    <string name="error_uv_required_no_pin">Verification required but no PIN is set on your security key</string>
+
+    <!-- User-friendly error messages (used by ErrorMapping) -->
+    <string name="error_tag_lost">Lost contact with the security key</string>
+    <string name="error_not_supported_tag">This NFC tag is not a security key</string>
+    <string name="error_not_security_key">Security key not recognized</string>
+    <string name="error_connection_failed">Could not connect to the security key</string>
+    <string name="error_not_connected">No security key connected</string>
+    <string name="error_key_disconnected">The security key disconnected</string>
+    <string name="error_communication_failed">Could not communicate with the security key</string>
+    <string name="error_no_credentials">No passkeys found on this security key</string>
+    <string name="error_pin_incorrect">Incorrect PIN</string>
+    <string name="error_pin_blocked">PIN is blocked</string>
+    <string name="error_pin_not_set">No PIN configured on this security key</string>
+    <string name="error_pin_auth_invalid">PIN authentication failed</string>
+    <string name="error_pin_auth_blocked">Too many failed PIN attempts</string>
+    <string name="error_credential_excluded">This passkey already exists</string>
+    <string name="error_operation_denied">Operation denied by security key</string>
+    <string name="error_operation_cancelled">Operation cancelled</string>
+    <string name="error_user_action_timeout">Touch was not detected in time</string>
+    <string name="error_timeout">Operation timed out</string>
+    <string name="error_key_store_full">Security key storage is full</string>
+    <string name="error_unsupported_algorithm">Unsupported security algorithm</string>
+    <string name="error_ctap_unknown">Security key error: %1$s</string>
+    <string name="error_unknown">An unexpected error occurred</string>
 
     <!-- Content descriptions -->
     <string name="security_key_icon_desc">Security Key</string>
@@ -75,16 +99,14 @@
     <string name="operation_cancelled">Operation cancelled</string>
     <string name="reading_device_info">Reading device info…</string>
     <string name="checking_cred_mgmt">Checking credential management support…</string>
-    <string name="error_parse_device_info">Error: Could not parse device info</string>
-    <string name="error_pin_blocked">Error: PIN is blocked. Device needs to be reset.</string>
+    <string name="error_parse_device_info">Could not parse device info</string>
     <string name="error_pin_status">Could not get PIN status</string>
     <string name="pin_required_title">PIN Required</string>
     <string name="pin_required_message">Enter your PIN to list credentials.\n\nRetries remaining: %1$d</string>
-    <string name="error_pin_min_length">Error: PIN must be at least 4 characters</string>
+    <string name="error_pin_min_length">PIN must be at least 4 characters</string>
     <string name="authenticating">Authenticating…</string>
-    <string name="error_init_pin_protocol">Error: Failed to initialize PIN protocol</string>
+    <string name="error_init_pin_protocol">Could not establish secure connection</string>
     <string name="verifying_pin">Verifying PIN…</string>
-    <string name="error_invalid_pin">Error: Invalid PIN</string>
     <string name="getting_metadata">Getting credential metadata…</string>
     <string name="enumerating_rps">Enumerating relying parties…</string>
     <string name="loading_credentials_for">Loading credentials for %1$s…</string>