AdMob works on Expo App in Emulator, but not showing on standalone apk on mobile

Please provide the following:

  1. SDK Version: 3.0.10
  2. Platforms(Android/iOS/web/all):Android

I have used the expo Admob lib to implement AdMob banners and interstitial Ads on my App. When running through expo cli on my emulator it works perfectly. However after bundling the apk and installing on mobile, the Ads are not showing anymore.

Anyone knows what could be causing this?