Admob on iOS and Android. Interstitial ads are showing but events are not firing.

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1

When I tested demo scene from the admob plugin for unity in empty project - the interstitial ads were showing and events were fired well. But when I am trying to integrate the plugin with my game - the interstitial ads are showing but events are not firing. I thought that it caused because of another plugin integrated with my game, but I tried also remove all the plugins and integrate only admob, and interstitial ads are showing but events still are not firing.

Here is my AdMobManager:
using System;
using UnityEngine;
using System.Collections;
using GoogleMobileAds.Api;

public class AdMobManager : MonoBehaviour {

	public static AdMobManager Instance{ get; private set; }

	private InterstitialAd _interstitial;
    private Action _callback;
#if UNITY_ANDROID
    string adUnitId = "MyAdUnitId";
#elif UNITY_IPHONE
    string adUnitId = "MyAdUnitId";
#else
	string adUnitId = "unexpected_platform";
#endif

	void Awake(){
		if (Instance == null)
			Instance = this;
		else if (Instance != null)
			Destroy (gameObject);

		DontDestroyOnLoad (gameObject);
	}

	void Start(){


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

		//SignEventsToHandlers ();
	}

	//Events handlers
	void OnAdClosed (object sender, System.EventArgs e){
		Debug.Log (string.Format ("AdMob.AdClosed - OK. sender: {0}, eventArgs: {1}", sender, e));
	    if (_callback != null) _callback();
        else Debug.Log("_callback is null");
	}

	void OnAdClosing (object sender, System.EventArgs e){
		Debug.Log (string.Format ("AdMob.AdClosing - OK. sender: {0}, eventArgs: {1}", sender, e));
	}

    //void OnAdFailedLoad (object sender, AdFailedToLoadEventArgs e){
    //    Debug.Log (string.Format ("AdMob.AdFailedLoad - OK. sender: {0}, eventArgs: {1}", sender, e));
    //}

    //void OnAdLeftApplication (object sender, System.EventArgs e){
    //    Debug.Log (string.Format ("AdMob.AdLeftApplication - OK. sender: {0}, eventArgs: {1}", sender, e));
    //}

    private void OnAdLoaded(object sender, System.EventArgs e){
        Debug.Log(string.Format("AdMob.AdLoaded - OK. sender: {0}, eventArgs: {1}", sender, e));
    }

    private void OnAdOpened(object sender, System.EventArgs e){
        Debug.Log(string.Format("AdMob.AdOpened - OK. sender: {0}, eventArgs: {1}", sender, e));
    }

    //Public interface
	public void ShowInterstital(Action callback){
	    //if (IapManager.Instance.IsXlPackBought) return;
	    _callback = callback;
        if (_interstitial.IsLoaded())
            _interstitial.Show();
	}

	//TODO: Every time to show interstital animation I need to request this ad from server, check if it was loaded successfully and then show it
	//TODO: Or mayby to see on events. Maybe there event something like this: OnInterstitial loaded;

	//Actions
	public void RequestInterstitial(){
		// Create an empty ad request.
#if UNITY_IOS
		AdRequest request = new AdRequest.Builder ().AddTestDevice (GameTools.GetIOSAdMobID ()).Build ();
		// Load the interstitial with the request.
		_interstitial.LoadAd(request);
#endif
#if UNITY_ANDROID
        _interstitial = new InterstitialAd(adUnitId);
        _interstitial.AdClosed += OnAdClosed;
        _interstitial.AdClosing += OnAdClosing;
        _interstitial.AdLoaded += OnAdLoaded;
	    _interstitial.AdOpened += OnAdOpened;
        AdRequest request = new AdRequest.Builder()
                .AddTestDevice(AdRequest.TestDeviceSimulator)
                .AddTestDevice("E6CDB888557BA9A0") // My device ID
                .AddKeyword("game")
                .SetGender(Gender.Male)
                .SetBirthday(new DateTime(1985, 1, 1))
                .TagForChildDirectedTreatment(false)
                .AddExtra("color_bg", "9B30FF")
                .Build();
	    _interstitial.LoadAd(request);
	    
#endif
	}
2

Same here, events are not firing. Did you figure out it?