AdMob banner statistic works, but cant see banner

Hi, I have banner and I configure device as a test device. I dont know why, But I see my statistic in AdMob "
Requests 14" even though it's a test device. But I cant see banner in game.
Nothing is displayed. Here is my code.

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using GoogleMobileAds.Api;
5.  
6. public class GoogleOglasi : MonoBehaviour
7. {
8.     private BannerView bannerView;
9.  
10.     public void Start()
11.     {
12.         this.RequestBanner();
13.     }
14.  
15.     private void RequestBanner()
16.     {
17.         #if UNITY_ANDROID
18.             string adUnitId = "ca-app-pub-1583xxxxxxxxxxxxxxxxxxxxxxx";
19.         #elif UNITY_IPHONE
20.             string adUnitId = "ca-app-pub-3940256099942544/2934735716";
21.         #else
22.             string adUnitId = "unexpected_platform";
23.         #endif
24.  
25.         // Create a 320x50 banner at the top of the screen.
26.         bannerView = new BannerView(adUnitId, AdSize.SmartBanner, AdPosition.Bottom);
27.  
28.         AdRequest request = new AdRequest.Builder()
29.   .AddTestDevice("xxxxxxx(hidden for privacy)xxxxxxxxxxxxxx")
30.   .Build();
31.  
32.         bannerView.LoadAd(request);
33.     }
34. }
35.