Reward video doesn't work (Admob)

Hello guys , i just trying to make ad showing when i press a button , and receive some coins back(in my case) .
This is my video reward script button . In Console its seem to be all okay , i will put a picture . I test also on my phone , when i press that button i receive a small message back with (AD IS NOT AVAILABLE AT THE MOMENT) . Thanks a lot for any help ..

Code (CSharp):

1. using GoogleMobileAds.Api;
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5.  
6. public class RewardedVideoButton : MonoBehaviour
7. {
8.     private const string ACTION_NAME = "rewarded_video";
9.  
10.     private void Start()
11.     {
12.         Timer.Schedule(this, 0.1f, AddEvents);
13.     }
14.  
15.     private void AddEvents()
16.     {
17. #if UNITY_ANDROID || UNITY_IOS
18.         if (AdmobController.instance.rewardBasedVideo != null)
19.         {
20.             AdmobController.instance.rewardBasedVideo.OnAdRewarded += HandleRewardBasedVideoRewarded;
21.         }
22. #endif
23.     }
24.  
25.     public void OnClick()
26.     {
27.         if (IsAvailableToShow())
28.             AdmobController.instance.ShowRewardBasedVideo();
29.         else if (!IsAdAvailable())
30.             Toast.instance.ShowMessage("Ad is not available at the moment");
31.         else
32.         {
33.             int remainTime = (int)(GameConfig.instance.rewardedVideoPeriod - CUtils.GetActionDeltaTime(ACTION_NAME));
34.             Toast.instance.ShowMessage("Please wait " + remainTime + " seconds for the next ad");
35.         }
36.     }
37.  
38.     public void HandleRewardBasedVideoRewarded(object sender, Reward args)
39.     {
40.  
41.     }
42.  
43.     public bool IsAvailableToShow()
44.     {
45.         return IsActionAvailable() && IsAdAvailable();
46.     }
47.  
48.     private bool IsActionAvailable()
49.     {
50.         return CUtils.IsActionAvailable(ACTION_NAME, GameConfig.instance.rewardedVideoPeriod);
51.     }
52.  
53.     private bool IsAdAvailable()
54.     {
55.         if (AdmobController.instance.rewardBasedVideo == null) return false;
56.         bool isLoaded = AdmobController.instance.rewardBasedVideo.IsLoaded();
57.         return isLoaded;
58.     }
59.  
60.     private void OnDestroy()
61.     {
62. #if UNITY_ANDROID || UNITY_IOS
63.         if (AdmobController.instance.rewardBasedVideo != null)
64.         {
65.             AdmobController.instance.rewardBasedVideo.OnAdRewarded -= HandleRewardBasedVideoRewarded;
66.         }
67. #endif
68.     }
69. }
70.  

 

i'm stuck here .. today i try to import again plugin , but the same result ..

 

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