Question Unable to get Google Play Games Services sign-in to work with Android game

For the past week, I have been fighting an uphill battle trying to get Google Play Games Services (GPGS) to authenticate and log in a user for my game. I am mostly using the sample code provided in the getting started guide provided by Google and as far as I can tell it is working as intended.

My problem is when I build my game to my Android device, the sign-in process fails before even being prompted to enter any sign-in info. I get the little banner that appears at the top of the screen that says connecting to google play games, then it disappears and shows a loading wheel for a few seconds before ultimately failing.

I have looked at the adb logcat and the only error I can get is "[Play Games Plugin 0.10.11] 09/26/20 16:28:53 -05:00 ERROR: No client available, returning null." I have scoured google but could not find anything that will fix this. There is a lot of conflicting documentation for the plugin when using Unity 2020 so this really has not made it easy. I have also tried everything I could possibly think of in the Google play console and API settings to get this to work.

I attached images of the full adb log. I also attached my code on the off chance it's the problem.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using Firebase.Auth;
5. using GooglePlayGames;
6. using GooglePlayGames.BasicApi;
7. using UnityEngine.SocialPlatforms;
8.  
9. public class GoogleAuthentication : MonoBehaviour
10. {
11.     public static GoogleAuthentication instance;
12.  
13.     public delegate void Authenticated();
14.     public static event Authenticated OnAuthenticated;
15.  
16.     public delegate void AuthenticationFailed();
17.     public static event AuthenticationFailed OnAuthenticationFailed;
18.  
19.     private string _authCode;
20.     public FirebaseUser user { get; private set; }
21.     public string userID { get; private set; }
22.     // Start is called before the first frame update
23.     void Awake()
24.     {
25.         if (instance != null)
26.         {
27.             Destroy(this.gameObject);
28.         }
29.         else
30.         {
31.             instance = this;
32.             DontDestroyOnLoad(instance);
33.         }
34.     }
35.  
36.     private void Start()
37.     {
38.         Authenticate();
39.     }
40.  
41.     public void Authenticate()
42.     {
43.         ConfigurePlayGamesClient();
44.         SignIn();
45.     }
46.  
47.     private void ConfigurePlayGamesClient()
48.     {
49.         PlayGamesClientConfiguration config =
50.         new PlayGamesClientConfiguration.Builder()
51.         .RequestEmail()
52.         .RequestServerAuthCode(false)
53.         .RequestIdToken()
54.         .Build();
55.  
56.         PlayGamesPlatform.Instance.GetIdToken();
57.  
58.         PlayGamesPlatform.InitializeInstance(config);
59.         PlayGamesPlatform.DebugLogEnabled = true;
60.         PlayGamesPlatform.Activate();
61.  
62.         Debug.Log("Configured Google Play Games Client");
63.     }
64.  
65.     private void SignIn()
66.     {
67.         PlayGamesPlatform.Instance.Authenticate(SignInInteractivity.CanPromptOnce, (result) => {
68.             // handle results
69.             if(result == SignInStatus.Success)
70.             {
71.                 Debug.Log("Signed into google play games");
72.                 _authCode = PlayGamesPlatform.Instance.GetServerAuthCode();
73.                 CreateFirebaseUser();
74.             }
75.             else
76.             {
77.                 Debug.Log("Unable to sign into google play!");
78.            
79.             }
80.         });
81.  
82.         //Social.localUser.Authenticate((bool success) =>
83.         //{
84.         //    if (success == true)
85.         //    {
86.         //        Debug.Log("Signed into google play games");
87.         //        _authCode = PlayGamesPlatform.Instance.GetServerAuthCode();
88.         //        CreateFirebaseUser();
89.         //    }
90.         //    else
91.         //    {
92.         //        Debug.Log("Unable to sign into google play!");
93.         //    }
94.         //});
95.     }
96.  
97.     private IEnumerator RetryLogin(float sleep)
98.     {
99.         yield return new WaitForSecondsRealtime(sleep);
100.         SignIn();
101.     }
102.  
103.     private void CreateFirebaseUser()
104.     {
105.         FirebaseAuth auth = FirebaseAuth.DefaultInstance;
106.         Credential credential =
107.         PlayGamesAuthProvider.GetCredential(_authCode);
108.         auth.SignInWithCredentialAsync(credential).ContinueWith(task => {
109.             if (task.IsCanceled)
110.             {
111.                 Debug.LogError("SignInWithCredentialAsync was canceled.");
112.                 return;
113.             }
114.             if (task.IsFaulted)
115.             {
116.                 Debug.LogError("SignInWithCredentialAsync encountered an error: " + task.Exception);
117.                 return;
118.             }
119.  
120.             FirebaseUser newUser = task.Result;
121.             Debug.LogFormat("User signed in successfully: {0} ({1})",
122.                 newUser.DisplayName, newUser.UserId);
123.         });
124.  
125.         user = auth.CurrentUser;
126.  
127.         OnAuthenticated();
128.  
129.         if (user != null)
130.         {
131.             Debug.Log("Signed into firebase");
132.             string playerName = user.DisplayName;
133.  
134.             // The user's Id, unique to the Firebase project.
135.             // Do NOT use this value to authenticate with your backend server, if you
136.             // have one; use User.TokenAsync() instead.
137.             string uid = user.UserId;
138.         }
139.         else
140.         {
141.             Debug.Log("Unable to sign into firebase");
142.             //Unable to sign in
143.         }
144.     }
145.  
146. }

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