Test ads aren't showing

hi guys,

really need your help.

Just added AdMob to my project.

I try to make my test ads to show but they aren’t showing after i build and run my game to my phone.

in the in the console said the following lines after I press button to show the banner view:

dummy .octr

dummy CeateBannerView

dmmy LoadAD

dummy ShowBannnerView

Please note that I’m using sample AppID and sample banner and sample interstitial !

this is my script:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using GoogleMobileAds.Api;

public class Admanager : MonoBehaviour
{

public static Admanager instance;

private string appID = "ca-app-pub-3940256099942544~3347511713";

private BannerView bannerView;

private string bannerID = "ca-app-pub-3940256099942544/6300978111";

private InterstitialAd fullScreenAd;
private string fullScreenAdID = "ca-app-pub-3940256099942544/1033173712";

private void Awake()
{
    if(instance == null)
    {
        instance = this;
    }

    else
    {
        Destroy(this);
    }
}

private void Start()
{
    MobileAds.Initialize(appID);
    //requestFullScreenAd();
    //requestBanner();
    //showFullScreenAD();
}

public void requestBanner()
{
    bannerView = new BannerView(bannerID, AdSize.Banner, AdPosition.Bottom);
    AdRequest request = new AdRequest.Builder().Build();

    bannerView.LoadAd(request);

    bannerView.Show();
}

public void hideBanner()
{
    bannerView.Hide();
}

public void requestFullScreenAd()
{
    fullScreenAd = new InterstitialAd(fullScreenAdID);

    AdRequest request = new AdRequest.Builder().Build();

    fullScreenAd.LoadAd(request);

}

public void showFullScreenAD()
{
    if (fullScreenAd.IsLoaded())
    {
        fullScreenAd.Show();
    }

    else
    {
        Debug.Log("full Screen Ad is not loaded loaded");
    }
}

}

i call requsetBanner from a button:

public void OnClickBanner()
{
    Admanager.instance.requestBanner();
}

my manifest:

Hello, I’m having the same problem here, did you manage to make it work ?