Admob not showing any adverts on Windows Phone 8 Nokia Lumia 820 device

[Paul Marques]

I recently added Admob to one of my applications #Notebox and although impressions seem to be coming thru I cannot see any on my test device (Lumia 820) using the production release of the app.  Also, during all development the test ads never showed, and I get an immediate InvalidRequest error on FailedToReceived eventhandler.  Anyone know whats going on?

My code matches the sample, see below:

            var _googleView = new AdView()

            {

                Format = AdFormats.SmartBanner,

#if DEBUG

                AdUnitID = "MY_AD_UNIT_ID"                

#else

                AdUnitID = "ca-app-pub-XXXXXXXXXXXX/XXXXXXX"                

#endif

            };

            _googleView.ReceivedAd += (sender, args) => Debug.WriteLine("Ad received - " + args.ToString());

            _googleView.FailedToReceiveAd += (sender, args) => Debug.WriteLine("Failed to received Ad - " + args.ErrorCode.ToString());

            var req = new AdRequest();

#if DEBUG

            req.ForceTesting = true;

#endif

            _googleView.SetValue(Grid.RowProperty, 2);

            LayoutRoot.Children.Add(_googleView);

            _googleView.LoadAd(req);

[Paul Marques]

So it seems that this issue is happening on ANY Window Phone 8.1 project.  Could it be that the current AdMob SDK only works properly with Windows Phone 8.0 ?