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Interstitial Ads fail to load with wifi

See original GitHub issue

Plugin Version

0.13.0

Describe the bug

Interstitial Ads fail to load with wifi but load with mobile data. I have add a test device in the AdMob UI and I use the correct ad format and AdMob App ID. I have followed the example app

void _createInterstitialAd() {
    InterstitialAd.load(
        adUnitId: '<my ad Interstitial id>',
        request: AdRequest(),
        adLoadCallback: InterstitialAdLoadCallback(
          onAdLoaded: (InterstitialAd ad) {
            _interstitialAd = ad;
          },
          onAdFailedToLoad: (LoadAdError error) {
            _interstitialAd = null;
            },
        )
    );
  }

  void _showInterstitialAd() {
    if (_interstitialAd == null) {
      return;
    }
    _interstitialAd.fullScreenContentCallback = FullScreenContentCallback(
      onAdDismissedFullScreenContent: (InterstitialAd ad) {
        ad.dispose();
      },
      onAdFailedToShowFullScreenContent: (InterstitialAd ad, AdError error) {
        ad.dispose();
        _createInterstitialAd();
      },
    );

Error

I/flutter (28543): InterstitialAd failed to load: LoadAdError(code: 0, domain: com.google.android.gms.ads, message: Internal error., responseInfo: ResponseInfo(responseId: 72KnYPHREJaY3gOE2aEQ, mediationAdapterClassName: , adapterResponses: [AdapterResponseInfo(adapterClassName: com.google.ads.mediation.admob.AdMobAdapter, latencyMillis: 522), description: {
I/flutter (28543):   "Adapter": "com.google.ads.mediation.admob.AdMobAdapter",
I/flutter (28543):   "Latency": 522,
I/flutter (28543):   "Credentials": {},
I/flutter (28543):   "Ad Error": {
I/flutter (28543):     "Code": 0,
I/flutter (28543):     "Message": "Internal error.",
I/flutter (28543):     "Domain": "com.google.android.gms.ads",
I/flutter (28543):     "Cause": "null"
I/flutter (28543):   }
I/flutter (28543): }, credentials: Bundle[{}], adError: AdError(code: 0, domain: com.google.android.gms.ads, message: Internal error.))])).

flutter doctor

[√] Flutter (Channel stable, 2.0.6, on Microsoft Windows [Versione 10.0.19042.844], locale it-IT)
    • Flutter version 2.0.6 at C:\Users\Antonio\flutter
    • Framework revision 1d9032c7e1 (3 weeks ago), 2021-04-29 17:37:58 -0700
    • Engine revision 05e680e202
    • Dart version 2.12.3

[√] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
    • Android SDK at C:\Users\Antonio\AppData\Local\Android\Sdk
    • Platform android-30, build-tools 30.0.3
    • ANDROID_HOME = C:\Users\Antonio\AppData\Local\Android\Sdk
    • Java binary at: C:\Program Files\Android\Android Studio1\jre\bin\java
    • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6842174)
    • All Android licenses accepted.

[√] Chrome - develop for the web
    • Chrome at C:\Program Files (x86)\Google\Chrome\Application\chrome.exe

[√] Android Studio (version 4.1.0)
    • Android Studio at C:\Program Files\Android\Android Studio1
    • Flutter plugin can be installed from:
       https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
       https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6842174)

[√] VS Code (version 1.55.2)
    • VS Code at C:\Users\Antonio\AppData\Local\Programs\Microsoft VS Code
    • Flutter extension version 3.21.0

[√] Connected device (2 available)
    • Chrome (web) • chrome • web-javascript • Google Chrome 90.0.4430.93
    • Edge (web)   • edge   • web-javascript • Microsoft Edge 90.0.818.62

• No issues found!
Process finished with exit code 0