Error getting firebase messaging token

[LucaVs]

I have an Android App that get the firebase messaging token with this code:

FirebaseMessaging.getInstance().getToken().addOnCompleteListener(
                        task -> {
                            if (task.isSuccessful()) {
                                Toast.makeText(this, "token ok", Toast.LENGTH_SHORT).show();
                                String token = task.getResult();
                                Log.i("token ---->>", token);
                                sendFirebaseToken(token);
                            } else {
                                Toast.makeText(this, "token fail", Toast.LENGTH_SHORT).show();

                                Toast.makeText(this, task.getException().toString(), Toast.LENGTH_SHORT).show();


                            }
                        }
                );

On a Googled android device it woks fine but on a Sony Xperia XA2 with Sailfish + Microg I have the exception:

IOException:SERVICE_NOT_AVAILABLE

On MicroG settings I have Cloud Messaging enabled and Connected. The same for Google device registration.

What could I check anymore?

Thanks

[mid-kid]

This sounds similar to my issue: #2832
If it is, can you help maybe make the simplest scenario that reproduces this bug? I feel it'd help a lot in debugging microg itself.

[LucaVs]

The only way I can suggest to reproduce the issue is the code I provided on my first post.
In my case I can't confirm it's related to microg itself or Sailfish OS.