[firebase_messaging]: PHONE_REGISTRATION_ERROR during FCM token generation

[Priyanshu-Agrawal321]

Is there an existing issue for this?

• I have searched the existing issues.

Which plugins are affected?

Messaging, Core

Which platforms are affected?

Android

Description

When attempting to generate an FCM token using FirebaseMessaging.instance.getToken() in a Flutter app, the following error occurs:

[firebase_messaging/unknown] java.io.IOException: java.util.concurrent.ExecutionException: java.io.IOException: PHONE_REGISTRATION_ERROR

Expected Behavior

• The FCM token should be generated successfully when Google Play Services is available and correctly configured.

Actual Behavior

• The app fails to generate the FCM token and throws a PHONE_REGISTRATION_ERROR.

Additional Notes

• Google Play Services is verified to be available (GooglePlayServicesAvailability.success).
• Internet connectivity is stable.
• This issue occurs on Android. The app has the necessary permissions (INTERNET and POST_NOTIFICATIONS) configured.

Reproducing the issue

Steps to reproduce:

1. Create a Flutter project and integrate Firebase using firebase_core and firebase_messaging.
2. Add the required google-services.json file to the project and set up Firebase as per the documentation.
3. Request an FCM token using `FirebaseMessaging.instance.getToken() in this device

Device Information

• Device Name: Realme 6
• Manufacturer: Realme
• Model Number: RMX2001
• Operating System Version: Android 11
• Processor: Octa-core
• RAM/Storage Configuration: 6GB RAM / 128GB Storage
• Custom UI/OS Details: Realme UI 2.0

4. Observe the error in the logs.

Minimal reproducible example:

import 'package:flutter/material.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_messaging/firebase_messaging.dart';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();

  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text("FCM Token Generation")),
        body: Center(
          child: ElevatedButton(
            onPressed: () async {
              try {
                String? token = await FirebaseMessaging.instance.getToken();
                print('FCM Token: $token');
              } catch (e) {
                print('Error generating FCM token: $e');
              }
            },
            child: Text("Generate Token"),
          ),
        ),
      ),
    );
  }
}


### Firebase Core version

3.8.0

### Flutter Version

3.27.0

### Relevant Log Output

```shell
---------- ERROR ----------
I/flutter (29394): [2025-01-11 21:14:03.999040 | Catcher 2 | INFO] [firebase_messaging/unknown] java.io.IOException: java.util.concurrent.ExecutionException: java.io.IOException: PHONE_REGISTRATION_ERROR
I/flutter (29394): [2025-01-11 21:14:03.999336 | Catcher 2 | INFO] 
I/flutter (29394): [2025-01-11 21:14:04.000439 | Catcher 2 | INFO] ------- STACK TRACE -------
I/flutter (29394): [2025-01-11 21:14:04.001468 | Catcher 2 | INFO] #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:646:7)
I/flutter (29394): [2025-01-11 21:14:04.001839 | Catcher 2 | INFO] #1      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:334:18)
I/flutter (29394): [2025-01-11 21:14:04.002125 | Catcher 2 | INFO] <asynchronous suspension>
I/flutter (29394): [2025-01-11 21:14:04.002437 | Catcher 2 | INFO] #2      MethodChannel.invokeMapMethod (package:flutter/src/services/platform_channel.dart:534:43)
I/flutter (29394): [2025-01-11 21:14:04.002688 | Catcher 2 | INFO] <asynchronous suspension>
I/flutter (29394): [2025-01-11 21:14:04.002927 | Catcher 2 | INFO] #3      MethodChannelFirebaseMessaging.getToken (package:firebase_messaging_platform_interface/src/method_channel/method_channel_messaging.dart:248:11)
I/flutter (29394): [2025-01-11 21:14:04.003186 | Catcher 2 | INFO] <asynchronous suspension>

Flutter dependencies

Dart SDK 3.6.0
Flutter SDK 3.27.0
mobile_app 2.0.1+25

dependencies:
android_id 0.3.6 [flutter]
android_play_install_referrer 0.4.0
firebase_analytics: ^11.3.6
firebase_core: ^3.9.0
firebase_dynamic_links: ^6.0.11
firebase_in_app_messaging: ^0.8.0+11
firebase_messaging: ^15.1.6
firebase_remote_config: ^5.2.0
flutter:
sdk: flutter

Additional context and comments

• SHA-1 and SHA-256 keys are correctly configured in the Firebase Console.
• Permissions (INTERNET, POST_NOTIFICATIONS) are added to AndroidManifest.xml.

** A screenshot of the Sentry log has been included to provide more details about the error.

Please provide guidance on resolving the PHONE_REGISTRATION_ERROR during FCM token generation.

[SelaseKay]

Hi @Priyanshu-Agrawal321, thank you for reporting this issue. This error typically occurs when the device lacks support for Google Play, as explained here: https://developers.google.com/android/reference/com/google/android/gms/iid/InstanceID#ERROR_MISSING_INSTANCEID_SERVICE. This might be the case for your situation. Could you please try running it on another device to verify? I'll proceed to close this issue for now.