Can sign in using Google Play Games Plugin, but unable to load scores from the leaderboard

Hi, Before entering t$$anonymous$$s question, I searched a lot (got stuck for 2 weeks on t$$anonymous$$s problem :'( ) I only aim the google leaderboards functionality in my Unity project. I followed the following steps:

1- Integrated google play games plugin as described in: https://github.com/playgameservices/play-games-plugin-for-unity

• Created a google play services game entry in my google play developer console and link it to my application (in the same console) with the package id com.o6systems.zray w$$anonymous$$ch is in open alpha test.

• I created creditentials and inserted my SHA1 of the keystore / key pair to the google api console.

• I created ac$$anonymous$$evements, 1 scoreboard and get my resources entered to the Window / GooglePlayGames/Setup / Android Setup

The keystore I used is the same that generates the SHA1 code. I entered it in the player settings and its passwords.

My package name is consistent in all platforms (in google api console, google play developer console, in unity everywhere)

I entered my test user to the test users in the console.

2- I entered the following codes for authentication in one of scripts work in my splashscreen scene:

 void Start () {
         #if UNITY_ANDROID
         ConfigureGooglePlay ();
         SignIn ();
         #endif
 }
 
 void ConfigureGooglePlay(){
 
             PlayGamesClientConfiguration config = new PlayGamesClientConfiguration.Builder()
                 .Build();
             PlayGamesPlatform.InitializeInstance(config);
         PlayGamesPlatform.DebugLogEnabled = true;
         PlayGamesPlatform.Activate();
 }
 
 void SignIn () {
         Social.localUser.Authenticate (success => {
             if (success) {
                 Debug.Log ("Authentication successful");
                 string userInfo = "Username: " + Social.localUser.userName +
                                   "\nUser ID: " + Social.localUser.id +
                                   "\nIsUnderage: " + Social.localUser.underage;
                 Debug.Log (userInfo);
 
             //    DisplayGPScore();
             } else
                 Debug.Log ("Authentication failed");
         });
     }

3- In Game Scene, on Game over I post the $$anonymous$$gh score of the user to the leaderboard using ReportScore function

 private void OnGameOver(){
         ...
         PostScore(_gm.$$anonymous$$ghScore);
         ..
         
         DisplayGPScore ();
     }
 
     internal void LoadUsersAndDisplay(ILeaderboard lb)
     {
         // get the user ids
         List<string> userIds = new List<string>();
 
         foreach(IScore score in lb.scores) {
             userIds.Add(score.userID);
         }
         // load the profiles and display (or in t$$anonymous$$s case, log)
         Social.LoadUsers(userIds.ToArray(), (users) =>
             {
                 string status = "Leaderboard loading: " + lb.title + " count = " +
                     lb.scores.Length;
                 foreach(IScore score in lb.scores) {
                     Debug.Log("" + score.rank + ":" + score.userID); 
 
                 }
                 Debug.Log(status);
             });
     }
 
 public void DisplayGPScore(){
 
         ILeaderboard lb = PlayGamesPlatform.Instance.CreateLeaderboard();
         lb.id = ZRayGameManager.WORLD_LEADERBOARD_ID;
         lb.LoadScores(ok =>
             {
                 if (ok) {
                     LoadUsersAndDisplay(lb);
                 }
                 else {
                     Debug.Log("Error retrieving leaderboardi");
                 }
             });
     }
 
 public void PostScore(int score){
         PlayGamesPlatform.Instance.ReportScore(score, ZRayGameManager.WORLD_LEADERBOARD_ID, (bool success) => {
 
             if(success){
                 Debug.Log("High score " + score + " posted");
             }else{
                 Debug.Log("High score " + score + " could not be posted");
 
             }
 
         });
     
     }
 
 

I simplified the codes (excluded unrelated parts)

I get the following output

 I/Unity   (15970):
 I/Unity   (15970): Authentication successful
 I/Unity   (15970):
 I/Unity   (15970): (Filename: ./artifacts/generated/common/runtime/UnityEngineDe
 bugBindings.gen.cpp Line: 37)
 I/Unity   (15970):
 I/Unity   (15970): Username: RighthandedTuba240
 I/Unity   (15970): User ID: g02637898988054749692
 I/Unity   (15970): IsUnderage: True
 I/Unity   (15970):
 I/Unity   (15970): (Filename: ./artifacts/generated/common/runtime/UnityEngineDe
 bugBindings.gen.cpp Line: 37)
 I/Unity   (15970):
 I/Unity   (15970):  [Play Games Plugin DLL] 07/17/16 18:46:52 +03:00 DEBUG: Repo
 rtScore: score=100, board=CgkIppHPm-wIEAIQCQ
 I/Unity   (15970):
 I/Unity   (15970): (Filename: ./artifacts/generated/common/runtime/UnityEngineDe
 bugBindings.gen.cpp Line: 37)
 I/Unity   (15970):
 I/Unity   (15970):  [Play Games Plugin DLL] 07/17/16 18:46:52 +03:00 DEBUG: Nati
 ve Submitting score: 100 for lb CgkIppHPm-wIEAIQCQ with metadata:
 I/Unity   (15970):
 I/Unity   (15970): (Filename: ./artifacts/generated/common/runtime/UnityEngineDe
 bugBindings.gen.cpp Line: 37)
 I/Unity   (15970):
 I/Unity   (15970): User is authenticated
 I/Unity   (15970):
 I/Unity   (15970): (Filename: ./artifacts/generated/common/runtime/UnityEngineDe
 bugBindings.gen.cpp Line: 37)
 I/Unity   (15970):
 I/Unity   (15970):  [Play Games Plugin DLL] 07/17/16 18:46:52 +03:00 DEBUG: Load
 Scores, board=GooglePlayGames.PlayGamesLeaderboard callback is System.Action`1[S
 ystem.Boolean]
 I/Unity   (15970):
 I/Unity   (15970): (Filename: ./artifacts/generated/common/runtime/UnityEngineDe
 bugBindings.gen.cpp Line: 37)
 I/Unity   (15970):
 I/Unity   (15970):  [Play Games Plugin DLL] 07/17/16 18:46:52 +03:00 DEBUG: Invo
 king user callback on game thread
 I/Unity   (15970):
 I/Unity   (15970): (Filename: ./artifacts/generated/common/runtime/UnityEngineDe
 bugBindings.gen.cpp Line: 37)
 I/Unity   (15970):
 I/Unity   (15970): High score 100 posted
 I/Unity   (15970):
 I/Unity   (15970): (Filename: ./artifacts/generated/common/runtime/UnityEngineDe
 bugBindings.gen.cpp Line: 37)
 I/Unity   (15970):
 I/Unity   (15970):  [Play Games Plugin DLL] 07/17/16 18:46:55 +03:00 DEBUG: Ente
 ring internal callback for LeaderboardManager#InternalFetchCallback
 I/Unity   (15970):
 I/Unity   (15970): (Filename: ./artifacts/generated/common/runtime/UnityEngineDe
 bugBindings.gen.cpp Line: 37)
 I/Unity   (15970):
 I/Unity   (15970):  [Play Games Plugin DLL] 07/17/16 18:47:10 +03:00 DEBUG: Star
 ting Auth Transition. Op: SIGN_OUT status: ERROR_NOT_AUTHORIZED
 I/Unity   (15970):
 I/Unity   (15970): (Filename: ./artifacts/generated/common/runtime/UnityEngineDe
 bugBindings.gen.cpp Line: 37)
 I/Unity   (15970):
 I/Unity   (15970):  [Play Games Plugin DLL] 07/17/16 18:47:10 +03:00 DEBUG: Ente
 ring internal callback for LeaderboardManager#InternalFetchSummaryCallback
 I/Unity   (15970):
 I/Unity   (15970): (Filename: ./artifacts/generated/common/runtime/UnityEngineDe
 bugBindings.gen.cpp Line: 37)
 I/Unity   (15970):
 W/Unity   (15970): !!! [Play Games Plugin DLL] 07/17/16 18:47:10 +03:00 WARNING:
  Error returned from fetchScoreSummary: GooglePlayGames.Native.PInvoke.FetchScor
 eSummaryResponse
 W/Unity   (15970):
 W/Unity   (15970): (Filename: ./artifacts/generated/common/runtime/UnityEngineDe
 bugBindings.gen.cpp Line: 37)
 W/Unity   (15970):
 I/Unity   (15970):  [Play Games Plugin DLL] 07/17/16 18:47:10 +03:00 DEBUG: Invo
 king user callback on game thread
 I/Unity   (15970):
 I/Unity   (15970): (Filename: ./artifacts/generated/common/runtime/UnityEngineDe
 bugBindings.gen.cpp Line: 37)
 I/Unity   (15970):
 I/Unity   (15970): Error retrieving leaderboardi

Conclusions:

1. The user CAN authenticate because the method Sign In() tells Authentication Successful and prints out the user information.

2. The user CAN post $$anonymous$$s / her score to the scoreboard, because the PostScore method tells "High Score 100 posted"

3. The user CANNOT display scoreboard scores, with an error of

W/Unity (15970): !!! [Play Games Plugin DLL] 07/17/16 18:47:10 +03:00 WARNING: Error returned from fetchScoreSummary: GooglePlayGames.Native.PInvoke.FetchScor eSummaryResponse

I can not find any setting of the scoreboard in console, to give the user access to t$$anonymous$$s scoreboard etc.

Please help!! I am stuck here for 2 weeks (but there is improvement, I was not able to sign in 3 days ago)