Authentication Issue with Play Games Plugin for Unity

Unity Version: 5.3.4f1
Plugin used: https://github.com/playgameservices/play-games-plugin-for-unity

Able to authenticate and sign out, but not able to log back in unless the application is restarted.

I have tried checking with "Social.localUser.authenticated" and signing out with "((GooglePlayGames.PlayGamesPlatform)Social.Active).SignOut()", which makes no difference.

Script:

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

using GooglePlayGames;
using GooglePlayGames.BasicApi;
using UnityEngine.SocialPlatforms;

public class GooglePlayGamesScript : MonoBehaviour
{
void Start ()
{
PlayGamesClientConfiguration config = new PlayGamesClientConfiguration.Builder()
// enables saving game progress.
.EnableSavedGames()
// registers a callback to handle game invitations received while the game is not running.
// .WithInvitationDelegate(<callback method>)
// registers a callback for turn based match notifications received while the
// game is not running.
// .WithMatchDelegate(<callback method>)
// requests the email address of the player be available.
// Will bring up a prompt for consent.
.RequestEmail()
// requests a server auth code be generated so it can be passed to an
// associated back end server application and exchanged for an OAuth token.
.RequestServerAuthCode(false)
// requests an ID token be generated. This OAuth token can be used to
// identify the player to other services such as Firebase.
.RequestIdToken()
.Build();

PlayGamesPlatform.InitializeInstance(config);
// recommended for debugging:
PlayGamesPlatform.DebugLogEnabled = true;
// Activate the Google Play Games platform
PlayGamesPlatform.Activate();

}


public void Authenticate()
{
if (!PlayGamesPlatform.Instance.IsAuthenticated())
{
Social.localUser.Authenticate((bool success) =>
{
// handle success or failure
});
}
else
{
PlayGamesPlatform.Instance.SignOut();
}

}
}

 

sorry to necro, but I have the exact same issue on Unity 2018.4.0 using GPGS version 0.9.64.
After authenticating in then signing out, the system just hangs on the subsequent call to Social.localUser.Authenticate, it never returns. Did anyone ever find a solution to this?

 

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