Google Play Services sign in not working well on Unity Android

I'm trying to add Google Play Services on my Unity Android project. I've got already implement google play services plugin to my project. Filling the all crediantials. I've got 2 different internal test accounts on developer console.

Here is my question:

• Account A: SignInStatus Success and not showing welcome pop-up message

  ---

• Account B: SignInStatus Canceled and not sign in.

  ---

Is it because internal test or something?

unity version: 2019.4.16f1
gpgs plugin verison: 0.11.01

Here is my code: referanced: https://github.com/playgameservices/play-games-plugin-for-unity

 using GooglePlayGames;
 private bool Authenticated;
 
 public void Start() {
   PlayGamesPlatform.Instance.Authenticate(ProcessAuthentication);
 }
 
 internal void ProcessAuthentication(SignInStatus status) {
   if (status == SignInStatus.Success) {
     // Continue with Play Games Services
     Authenticated = true;
   } else {
     // Disable your integration with Play Games Services or show a login button
     // to ask users to sign-in. Clicking it should call
     // PlayGamesPlatform.Instance.ManuallyAuthenticate(ProcessAuthentication).
     Authenticated = false;
   }
 }