Google Play Leaderboard Problem

First Hello from the new user!

I want to install in my app GooglyPlay. I have followed the instructions of the Plugin for Unity. In Google Play, I’ve set up a leaderboard and created an API. Unity received the package and the setup was executed.

I have now created this script:

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

public class Google : MonoBehaviour {

    private void Start() {
        PlayGamesClientConfiguration config = new PlayGamesClientConfiguration.Builder().Build();
        PlayGamesPlatform.DebugLogEnabled = true;
        PlayGamesPlatform.InitializeInstance(config);
        PlayGamesPlatform.Activate();
    }

    public void LogIn() {
        Social.localUser.Authenticate((bool succes) => {
            if (succes) {
                Debug.Log("Erfolgreich eingeloggt!");
            } else {
                Debug.Log("Fehler beim Einloggen!");
            }
        });
    }

    public void LogOut() {
        ((PlayGamesPlatform)Social.Active).SignOut();
    }

    public void PunkteInBestenlisteEintragen() {
        Social.ReportScore(500, GPGSIds.leaderboard_highscore, (bool success) => {
        });
    }

    public void BestenlisteAnzeigen() {
        PlayGamesPlatform.Instance.ShowLeaderboardUI();
        // Social.ShowLeaderboardUI();
    }

    public void SpezielleBestenlisteAnzeigen() {
        PlayGamesPlatform.Instance.ShowLeaderboardUI(GPGSIds.leaderboard_highscore);

    }
}

The login and logout functions. It does not work, however, calling the leaderboard and entering points.

I have already read some topics, but unfortunately no solution for my problem found.

Hope you can help me!

Many Thanks!

No one idea? ^^