AchievementsUI and LeaderboardsUI won't popup. Signing in works and unlocked achievements popups work

Question

So. I have made a game with unity 5. And i have downloaded and configured the google play services plugin. I can sign in and unlock achievements with success. But for some reason the

Social.ShowAchievementsUI();

and

Social.ShowLeaderboardUI();

Won't work. Or anything won't popup.

So I'm trying to show the list of achievements and show the list of leaderboards available. I have 5 Achievements and 4 Leaderboards. I have this version of the game on Google Play alpha test. With the 2 buttons for Opening achievements menu and leaderboards but those won't work.
My code for login is:

void Start () {

    if (PlayGamesPlatform.Instance.IsAuthenticated() == false)

    { 

        PlayGamesClientConfiguration config = new PlayGamesClientConfiguration.Builder().Build();

        PlayGamesPlatform.InitializeInstance(config);

        PlayGamesPlatform.DebugLogEnabled = true;

        PlayGamesPlatform.Activate();

        SignIn();

    }



void SignIn()

{

        Social.localUser.Authenticate((bool success) =>

        {});

}

for showing

achievementsUI

:

public void ShowAchievementsUI()

{

    Social.ShowAchievementsUI();

}

for showing

Leaderboard ui

:

public void ShowLeaderboardsUI()

{

    Social.ShowLeaderboardUI();

}

These 2 are called from buttons.

i am using:

using System.Collections;

using System.Collections.Generic;

using UnityEngine;

using GooglePlayGames;

using UnityEngine.SocialPlatforms;

using GooglePlayGames.BasicApi;

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Answer 1

Adding:

 <activity android:name="com.google.games.bridge.NativeBridgeActivity"
       android:theme="@android:style/Theme.Translucent.NoTitleBar.Fullscreen" />

To AndroidManifest.xml fixed the issue

AchievementsUI and LeaderboardsUI won't popup. Signing in works and unlocked achievements popups work

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