AdMob Rewarded Video

I'm trying to make it so that you can pass the level by watching rewarded ad.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using GoogleMobileAds.Api;
 using GoogleMobileAds;
 using System;
 
 public class AdManager : MonoBehaviour
 {
 
     public GameManager gm;
 
     public RewardBasedVideoAd rewardVideo;
 
     public int adHasBeenShown;
 
     public void Start()
     {
         adHasBeenShown = 0;
 
         this.rewardVideo = RewardBasedVideoAd.Instance;
 
         rewardVideo.OnAdRewarded += HandleRewardVideoRewarded;
         rewardVideo.OnAdFailedToLoad += HandleOnAdFailedToLoad;
         rewardVideo.OnAdClosed += HandleRewardVideoClosed;
 
         this.RequestRewardVideoo();
     }
 
     public void RequestRewardVideoo()
     {
 #if UNITY_ANDROID
         string rewardedAdID = "ca-app-pub-3940256099942544/5224354917";
 #else
         string rewardedAdID = "unexpected_platform";
 #endif
         AdRequest request = new AdRequest.Builder().Build();
 
         this.rewardVideo.LoadAd(request, rewardedAdID);
     }
 
     public void OnCompleteButtonPressed()
     {
         if (rewardVideo.IsLoaded())
         {
             rewardVideo.Show();
         }
     }
 
     public void HandleRewardVideoRewarded(object sender, Reward args)
     {
         gm.CompleteLevel();
     }
 
     public void HandleOnAdFailedToLoad(object sender, AdFailedToLoadEventArgs args)
     {
         this.RequestRewardVideoo();
     }
 
     public void HandleRewardVideoClosed(object sender, EventArgs args)
     {     
         this.RequestRewardVideoo();
     }
 
 }

gm.CompleteLevel() looks like this:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using System.Linq;
 using UnityEngine.UI;
 using DG.Tweening;
 
 public class GameManager : MonoBehaviour {
 
     public void CompleteLevel()
     {
         foreach (GameObject go in AllSymbols)
         {
             go.GetComponent<AllSymbolsScript>().canMove = true;
             go.GetComponentInChildren<Text>().color = new Color32(255, 255, 255, 255);
         }
 
         foreach (GameObject go in UncorrectSymbols)
         {
             go.GetComponentInParent<Button>().interactable = true;
             go.SetActive(true);
         }
 
         if (!currentLevel.Completed)
             money += 2;
 
 
         moneyText.text = money.ToString();
 
         foreach (GameObject go in CurrSymbols)
         {
             if (go.GetComponent<CurrentCells>().selfChar != null)
             {
                 go.GetComponent<CurrentCells>().selfChar.GetComponent<AllSymbolsScript>().ReturnToHome();
             }
 
             Destroy(go);
         }
 
         LevelDonePanel.alpha = 1;
         LevelDonePanel.blocksRaycasts = true;
 
         currLevel += 1;
 
         levelText.text = "Уровень: " + currLevel;
 
         bM.DisableGamePanel();
         nlS.LevelDone();  
     }
 }
 

The ad comes up, I wait until it's over, and I close it. All that is in the script works fine, except bM.DisableGamePanel() and nlS.LevelDone(). These two methods are not called.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.UI;
 
 public class ButtonManager : MonoBehaviour {
 
     public LevelPanelManager LPM;
 
     public AudioManager audioManager;
 
     public CanvasGroup friendHelpPanel;
     public CanvasGroup PodskazkiPanel;
     public CanvasGroup levelPanel;
     public CanvasGroup moneyPanel;
     public CanvasGroup gamePanel;
     public CanvasGroup currSymbolPanel;
     public CanvasGroup keyboardPanel;
     public Button soundButton;
     public Sprite soundOnImage;
     public Sprite soundOffImage;
     public bool soundBool = true;
 
     public void DisableGamePanel()
     {
         audioManager.Play("MenuOpen1");
         audioManager.Play("MenuOpen2");
         gamePanel.alpha = 0;
         gamePanel.blocksRaycasts = false;
         currSymbolPanel.alpha = 0;
         currSymbolPanel.blocksRaycasts = false;
         keyboardPanel.alpha = 0;
         keyboardPanel.blocksRaycasts = false;
     }
 }

 public class NextLevelScript : MonoBehaviour {
 
     public Image image;
     public GameManager gm;
     public Text nameText;
     public GameObject moneyText;
     public AudioManager audioManager;
 
     public void LevelDone()
     {
         audioManager.Play("Win");
         image.sprite = gm.currentLevel.image;
         nameText.text = gm.currentLevel.name;
 
         if (gm.currentLevel.Completed)
             moneyText.SetActive(false);
         else
             moneyText.SetActive(true);
 
         gm.currentLevel.Completed = true;
     }
 
 }

If I just bind a method CompleteLevel() to a button and call it, everything works fine.