AdMob Test Banner and Interstitial ads not showing on my test device

I have two scripts implemented in my Unity project, the one for my Banner ad:

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

public class Banner : MonoBehaviour
{

    // Use this for initialization
    void Start()
    {

        showBannerAd();

    }

    private void showBannerAd()
    {
        string adID = "ca-app-pub-9257400980294652/4995017052";

        //***For Testing in the Device***
        AdRequest request = new AdRequest.Builder()
       .AddTestDevice(AdRequest.TestDeviceSimulator)       // Simulator.
       .AddTestDevice("3812AE58DCC9AA8")  // My test device.
       .Build();

        //***For Production When Submit App***
        //AdRequest request = new AdRequest.Builder().Build();

        BannerView bannerAd = new BannerView(adID, AdSize.SmartBanner,
AdPosition.Bottom);
        bannerAd.LoadAd(request);
    }
}

and the on for my interstitial ads:

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

public class Interstitial1 : MonoBehaviour
{

    bool hasShownAdOneTime;

    // Use this for initialization
    void Start()
    {
        //Request Ad
        RequestInterstitialAds();
    }

    void Update()
    {
        if (SCORESCRIPT.scoreValue >= 0)  //***this is just for the testing purposes ***
        {
                Invoke("showInterstitialAd", 3.0f);
        }
    }

    public void showInterstitialAd()
    {
        //Show Ad
        if (interstitial.IsLoaded())
        {
            interstitial.Show();

            //Stop Sound
            //

            Debug.Log("SHOW AD XXX");
        }

    }

    InterstitialAd interstitial;
    private void RequestInterstitialAds()
    {
        string adID = "ca-app-pub-9257400980294652/4995017052";

#if UNITY_ANDROID
        string adUnitId = adID;
#elif UNITY_IOS
        string adUnitId = adID;
#else
        string adUnitId = adID;
#endif

        // Initialize an InterstitialAd.
        interstitial = new InterstitialAd(adUnitId);

        //***Test***
        AdRequest request = new AdRequest.Builder()
       .AddTestDevice(AdRequest.TestDeviceSimulator)       // Simulator.
       .AddTestDevice("3812AE58DCC9AA8")  // My test device.
       .Build();

        //***Production***
        //AdRequest request = new AdRequest.Builder().Build();

        //Register Ad Close Event
        interstitial.OnAdClosed += Interstitial_OnAdClosed;

        // Load the interstitial with the request.
        interstitial.LoadAd(request);

        Debug.Log("AD LOADED XXX");

    }

    //Ad Close Event
    private void Interstitial_OnAdClosed(object sender, System.EventArgs e)
    {
        //Resume Play Sound

    }
}

I am using my real ad ID-s and my real test device ID. When I run the game in unity I get this as my Debug Log:

Dummy .ctor, Dummy CreateInterstitialAd, Dummy LoadAd, AD LOADED XXX

and for my banner ad:

Dummy .ctor, Dummy CreateBannerView, Dummy LoadAd,

I have no idea why my code doesn’t work on my device when the same code worked for the other people who used it in their games. If you have any other code recommendations feel free to share.

I am familiar with the fact that there are many similar threads all over the internet but none of them solved my problem successfully as I am very new to AdMob and Unity.

Hear that you’re facing issues with AdMob test banner and interstitial ads not showing on your test device. There could be several reasons for this problem:

1. Test Mode: Ensure that you’ve set your AdMob ads to test mode while developing your app. This prevents actual ads from displaying during testing.

2. Test Device: Verify that you’ve added the correct test device ID in your AdMob settings. This ensures that test ads are displayed on your designated test device.

3. Network Connectivity: Ensure that your test device is connected to the internet, as AdMob test ads require an active connection.

4. Ad Unit IDs: Double-check that you’re using the correct test ad unit IDs provided by AdMob for both banner and interstitial ads.

5. Ad Request Implementation: Verify that you’ve correctly implemented the ad request code in your app, including the placement of ad views in your layout.

6. AdMob SDK Version: Make sure you’re using the latest version of the AdMob SDK to avoid compatibility issues.

7. Ad Blocking Software: Disable any ad-blocking software or apps on your test device that might interfere with ad display.

If the issue persists, consult the AdMob documentation or community forums for specific troubleshooting steps or reach out to AdMob support for assistance. Debugging log messages and error codes can also provide valuable insights into the problem.