Firebase Remote Config BUG

I have an issue in unity with Firebase Remote Config. v8.1 I Call InitRemoteConfig() then Fetch, but I recive Faulted status in the callback. also unity freezes after stop runing the game and I am back at the editor, if I press play again, unity freezes. Can you help me searching what I am doing wrong? thank you.

 public void InitRemoteConfig()
     {
         System.Collections.Generic.Dictionary<string, object> defaults = new System.Collections.Generic.Dictionary<string, object>();
 
         // These are the values that are used if we haven't fetched data from the
         // server
         // yet, or if we ask for values that the server doesn't have:
        /* defaults.Add("config_test_string", "default local string");
         defaults.Add("config_test_int", 1);
         defaults.Add("config_test_float", 1.0);
         defaults.Add("config_test_bool", false);*/
             
         defaults.Add("BoneCollectableSpawnChance", 0.63);
         defaults.Add("BoneCollectableReward", 25);
         defaults.Add("FearRequiredToPlayOnline", 50);
         defaults.Add("UpgradeLevelMultiplier", 0.05);
         defaults.Add("DailyRewardBasePrice", 100);
 
         Firebase.RemoteConfig.FirebaseRemoteConfig.DefaultInstance.SetDefaultsAsync(defaults).ContinueWithOnMainThread(setTask =>
         {
             Debug.Log("RemoteConfig configured and ready!");
             isRemoteConfigInitialized = true;
         });
     }
 
     public Task FetchDataAsync() {
       Debug.Log("Fetching data...");
       System.Threading.Tasks.Task fetchTask =
       Firebase.RemoteConfig.FirebaseRemoteConfig.DefaultInstance.FetchAsync(
           TimeSpan.Zero);
       return fetchTask.ContinueWithOnMainThread(FetchComplete);
     }
     //[END fetch_async]
 
     void FetchComplete(Task fetchTask) {
       if (fetchTask.IsCanceled) {
         Debug.Log("Fetch canceled.");
       } else if (fetchTask.IsFaulted) {
         Debug.Log("Fetch encountered an error." + fetchTask.Status.ToString());
       } else if (fetchTask.IsCompleted) {
         Debug.Log("Fetch completed successfully!");
       }
 
       var info = Firebase.RemoteConfig.FirebaseRemoteConfig.DefaultInstance.Info;
       switch (info.LastFetchStatus) {
         case Firebase.RemoteConfig.LastFetchStatus.Success:
           Firebase.RemoteConfig.FirebaseRemoteConfig.DefaultInstance.ActivateAsync().ContinueWithOnMainThread(task => {
             Debug.Log(string.Format("Remote data loaded and ready (last fetch time {0}).",info.FetchTime));
           });
 
           break;
         case Firebase.RemoteConfig.LastFetchStatus.Failure:
           switch (info.LastFetchFailureReason) {
             case Firebase.RemoteConfig.FetchFailureReason.Error:
               Debug.Log("Fetch failed for unknown reason");
               break;
             case Firebase.RemoteConfig.FetchFailureReason.Throttled:
               Debug.Log("Fetch throttled until " + info.ThrottledEndTime);
               break;
           }
           break;
         case Firebase.RemoteConfig.LastFetchStatus.Pending:
           Debug.Log("Latest Fetch call still pending.");
           break;
       }
     }