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: