Initialization functionality unavailable for this session, in google Ads
In my case, I solved this error by adding the following lines to my onCreate method:
MobileAds.initialize(this, new OnInitializationCompleteListener() { @Override public void onInitializationComplete(InitializationStatus initializationStatus) { }});mAdView = findViewById(R.id.adView);AdRequest adRequest = new AdRequest.Builder().build();mAdView.loadAd(adRequest);