title: onAdFailedtoLoad: 3 error only on Android version of Flutter app for AdMob
body: <p>I am trying to load banner, interstitial and rewarded video ads in my app. I have tested my code thoroughly and all my code works with test IDs. I replaced the test ID's with my actual Admob ID's and it works on the iOS version of my app, however when I tested the same on the APK release version of my app on my device it didn't load, I have integrated Facebook mediation as well selected 'contains ads' in the Developer Play Console. Recently, I had unpublished my app to make a few changes. I uploaded the app with my AdMob ID's and I'm still facing this problem. What can I do about it? My Admob account is on good terms with the AdMob policies.</p>
  
  <pre><code>W/flutter onAdFailedToLoad: 3
  </code></pre>