Subscribing/Unsubscribing to topics doesn't work on Android[Bug]

[AOEGame]

[REQUIRED] Please fill in the following fields:
Unity editor version: _2020.3.17f
Firebase Unity SDK version: 9.1.0, 9.2.0
Source you installed the SDK: __unitypackage
Problematic Firebase Component: Messaging
Other Firebase Components in use: Analytics
Additional SDKs you are using: Analytics，Crashlytics
Platform you are using the Unity editor on: Windows
Platform you are targeting:Android
Scripting Runtime: IL2CPP
[REQUIRED] Please describe the issue here:
Firebase.Messaging.FirebaseMessaging.UnsubscribeAsync(topic).ContinueWith(task =>
{
Debug.Log("FirebaseMessaging.UnsubscribeAsync:" + topic + " status:" + task.Status);

    });

I can not get the debug.log.
also test: awit Firebase.Messaging.FirebaseMessaging.UnsubscribeAsync

android version: 9

Relevant Code:
Firebase.FirebaseApp.LogLevel = Firebase.LogLevel.Verbose;
Firebase.Messaging.FirebaseMessaging.TokenRegistrationOnInitEnabled = true;
Firebase.Analytics.FirebaseAnalytics.SetAnalyticsCollectionEnabled(true);

        Firebase.Messaging.FirebaseMessaging.TokenReceived += OnTokenReceived;
        Firebase.Messaging.FirebaseMessaging.MessageReceived += OnMessageReceived;
        string topic = "Lan_en";

    Firebase.Messaging.FirebaseMessaging.UnsubscribeAsync(topic).ContinueWith(task =>
    {
        Debug.Log("FirebaseMessaging.UnsubscribeAsync:" + topic + " status:" + task.Status);
       
    });

=============
After a lot of testing, I found out that the first launch then subscribe topic is successful. After restart our game then subscribe topic, the subscribeAsync task can not finish.

no error message.

the subscribeAsync task does not have any completion information.

Had set LogLevel:
Firebase.FirebaseApp.LogLevel = Firebase.LogLevel.Debug;

but no error message in android studio logcat!

[paulinon]

Hi @AOEGame,

I noticed that the content of this thread is similar to this one. I'll be closing this one so that all discussions can be streamlined in one thread.