Firebase Android FCM INVALID_SENDER when trying to get token

Question

I created a google-services.json file and added to my android project but when I tried to get a token I received this exception:

{
Java.IO.IOException: java.util.concurrent.ExecutionException: java.io.IOException: INVALID_SENDER ---> Java.Util.Concurrent.ExecutionException: java.io.IOException: INVALID_SENDER ---> Java.IO.IOException: INVALID_SENDER
   --- End of inner exception stack trace ---
   --- End of inner exception stack trace ---
  at VTInRoomApp.Droid.XamarinForms.MainActivityXam.OnComplete (Android.Gms.Tasks.Task task) [0x00039] in T:\Work\VT\Dev\Mobile\Xamarin\VTInRoomApp\VTInRoomApp\VTInRoomApp.Android\XamarinForms\MainActivityXam.cs:157 
  --- End of managed Java.IO.IOException stack trace ---
java.io.IOException: java.util.concurrent.ExecutionException: java.io.IOException: INVALID_SENDER
    at com.google.firebase.messaging.FirebaseMessaging.blockingGetToken(com.google.firebase:firebase-messaging@@22.0.0:14)
    at com.google.firebase.messaging.FirebaseMessaging.lambda$getToken$2$FirebaseMessaging(com.google.firebase:firebase-messaging@@22.0.0:1)
    at com.google.firebase.messaging.FirebaseMessaging$$Lambda$3.run(com.google.firebase:firebase-messaging@@22.0.0)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:428)
    at java.util.concurrent.FutureTask.run(FutureTask.java:237)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:272)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
    at com.google.android.gms.common.util.concurrent.zza.run(com.google.android.gms:play-services-basement@@17.6.0:2)
    at java.lang.Thread.run(Thread.java:761)
Caused by: java.util.concurrent.ExecutionException: java.io.IOException: INVALID_SENDER
    at com.google.android.gms.tasks.Tasks.zza(com.google.android.gms:play-services-tasks@@17.2.1:5)
    at com.google.android.gms.tasks.Tasks.await(com.google.android.gms:play-services-tasks@@17.2.1:8)
    at com.google.firebase.messaging.FirebaseMessaging.blockingGetToken(com.google.firebase:firebase-messaging@@22.0.0:10)
    ... 9 more
Caused by: java.io.IOException: INVALID_SENDER
    at com.google.firebase.messaging.GmsRpc.handleResponse(com.google.firebase:firebase-messaging@@22.0.0:7)
    at com.google.firebase.messaging.GmsRpc.lambda$extractResponseWhenComplete$0$GmsRpc(com.google.firebase:firebase-messaging@@22.0.0:1)
    at com.google.firebase.messaging.GmsRpc$$Lambda$1.then(com.google.firebase:firebase-messaging@@22.0.0)
    at com.google.android.gms.tasks.zzc.run(com.google.android.gms:play-services-tasks@@17.2.1:3)
    at com.google.firebase.messaging.GmsRpc$$Lambda$0.execute(com.google.firebase:firebase-messaging@@22.0.0)
    at com.google.android.gms.tasks.zzd.zza(com.google.android.gms:play-services-tasks@@17.2.1:1)
    at com.google.android.gms.tasks.zzr.zzb(com.google.android.gms:play-services-tasks@@17.2.1:5)
    at com.google.android.gms.tasks.zzw.zza(com.google.android.gms:play-services-tasks@@17.2.1:3)
    at com.google.android.gms.tasks.zzc.run(com.google.android.gms:play-services-tasks@@17.2.1:8)
    at com.google.android.gms.cloudmessaging.zzz.execute(com.google.android.gms:play-services-cloud-messaging@@17.0.0)
    at com.google.android.gms.tasks.zzd.zza(com.google.android.gms:play-services-tasks@@17.2.1:1)
    at com.google.android.gms.tasks.zzr.zzb(com.google.android.gms:play-services-tasks@@17.2.1:5)
    at com.google.android.gms.tasks.zzw.zza(com.google.android.gms:play-services-tasks@@17.2.1:3)
    at com.google.android.gms.tasks.TaskCompletionSource.setResult(com.google.android.gms:play-services-tasks@@17.2.1:1)
    at com.google.android.gms.cloudmessaging.zzp.zzd(com.google.android.gms:play-services-cloud-messaging@@17.0.0:3)
    at com.google.android.gms.cloudmessaging.zzr.zza(com.google.android.gms:play-services-cloud-messaging@@17.0.0:2)
    at com.google.android.gms.cloudmessaging.zzf.handleMessage(com.google.android.gms:play-services-cloud-messaging@@17.0.0:14)
    at android.os.Handler.dispatchMessage(Handler.java:98)
    at android.os.Looper.loop(Looper.java:154)
    at android.app.ActivityThread.main(ActivityThread.java:6157)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:802)
}

Did I mess up when I created the google-servies.json or is it something in my code?

Thank you very much

Answer 1

Normally, this error caused by the json file. Check the information below to confirm.

1. Check that you have copied your file in correct project folder and have set the Build Action to GoogleServicesJson .
2. Check the file is correct and matches with latest downloaded google-services.json file in FCM.
3. Check that is there any duplicate file of google-services.json present in your project.
4. Please note when google-services.json is added to the project (and the GoogleServicesJson build action is set), the build process extracts the client ID and API key and then adds these credentials to the merged/generated AndroidManifest.xml that resides at obj/Debug/android/AndroidManifest.xml . If you could confirm everything is correect, delete the bin and obj to clean and rebuild and reopen the project may helpful.
5. If you still have this issue, create a new project to follow the steps in the MS docs. https://learn.microsoft.com/en-us/xamarin.android/data-cloud/google-messaging/remote-notifications-with-fcm?tabs=windows

Answer 2

Try this

FirebaseMessaging.getInstance().getToken()
.addOnCompleteListener(new OnCompleteListener<String>() {
    @Override
    public void onComplete(@NonNull Task<String> task) {
      if (!task.isSuccessful()) {
        Log.w(TAG, "Fetching FCM registration token failed", task.getException());
        return;
      }

      // Get new FCM registration token
      String token = task.getResult();

      // Log and toast
      String msg = getString(R.string.msg_token_fmt, token);
      Log.d(TAG, msg);
      Toast.makeText(MainActivity.this, msg, Toast.LENGTH_SHORT).show();
    }
});