Unity, InterstitialAd, failed to load - Internal error

[Chaz Ashley]

Hallo guys.

I use Unity 5.4.0p2 and Google Mobile Ads Unity Plugin v3.0.6.

At first I checked the Banner ad and it worked perfectly. Then I tried Interstitial ad and it does not work.

I took the code from tutorial and now I have only one script in my project

using UnityEngine;

using GoogleMobileAds.Api;

public class AdMobTest : MonoBehaviour {

    InterstitialAd interstitial;

    void Start()

    {

        RequestBanner();

    }

    private void RequestBanner()

    {

#if UNITY_ANDROID

        string adUnitId = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";

#elif UNITY_IPHONE

        string adUnitId = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";

#else

        string adUnitId = "unexpected_platform";

#endif

        // Create a 320x50 banner at the top of the screen.

        interstitial = new InterstitialAd(adUnitId);

        // Create an empty ad request.

        AdRequest request = new AdRequest.Builder().Build();

        // Load the banner with the request.

        interstitial.LoadAd(request);

        interstitial.OnAdLoaded += ShowAd;

        interstitial.OnAdFailedToLoad += FailedToLoad;

    }

    private void FailedToLoad(object sender, AdFailedToLoadEventArgs e)

    {

        Debug.Log("failed to load: " + e.Message);

    }

    void ShowAd(object sender, System.EventArgs args)

    {

        Debug.Log("loaded");

        interstitial.Show();

    }

}

In log I can see this failed to load: Internal error

So how do I fix it? 

[Chaz Ashley]

Now it works! I just takes some time before this kind of ads is ready to use. (about few hours)