Cant sign in from my build to Google Play

Ive integrated Google Play services and built an APK. But when I install it on my device, and try to sign in, I get a failed report

using UnityEngine;
using System.Collections;
using GooglePlayGames;
using GooglePlayGames.BasicApi;
using UnityEngine.SocialPlatforms;
using System.Collections.Generic;
using UnityEngine.UI;
public class LBDemo : MonoBehaviour
{
    public string leaderboard;
    public Text loginText;
    public Text leaderboardText;
    public Text logoutText;
    void Start ()
    {
        PlayGamesClientConfiguration config = new PlayGamesClientConfiguration ();
        PlayGamesPlatform.InitializeInstance (config);
        PlayGamesPlatform.Activate ();
        PlayGamesPlatform.DebugLogEnabled = true;
        logoutText.text = "initialized";

    }
    public void LogIn ()
    {
        Social.localUser.Authenticate ((bool success) =>
            {
                if (success) {
                    loginText.text = "Login success";
                } else {
                    loginText.text = "Login failed";
                }
            });
    }
    public void OnShowLeaderBoard ()
    {
        if (Social.localUser.authenticated) {
            Social.ShowLeaderboardUI (); // Show all leaderboard
            //((PlayGamesPlatform)Social.Active).ShowLeaderboardUI (leaderboard); // Show current (Active) leaderboard
        } else {
            leaderboardText.text = "Login Failed";
        }
    }
    public void OnAddScoreToLeaderBorad (long score)
    {
        if (Social.localUser.authenticated) {
            Social.ReportScore (score, leaderboard, (bool success) =>
                {
                    if (success) {
                        Debug.Log ("Update Score Success");

                    } else {
                        Debug.Log ("Update Score Fail");
                    }
                });
        }
    }
    public void OnLogOut ()
    {
        ((PlayGamesPlatform)Social.Active).SignOut ();
    }
}

The first image is when I open my app, The second is when I click Login, Ignore the third the fourth one, My mistake and the last one after I try to sign in by selecting an account

Have you configured google play games plugin correctly ?
Have you built your game with correct keystore ? Have you put the Sha1-Fingerprint of the keystore in google play games panel ?
If you have not signed the game correctly or you have not put the fingerprint there it does not work. And if you have not published the game in google play games make sure you have added the email you are tying to sign in with into testers.

yeah I found out that I didnt have my email id in the list of testers. Thanks.