After battling for a long time to simply get firebase auth to work in an expo app, having face issues with signInWithPopup, signInWithRedirect, Async storage, and other such problems, it was decided to simply use Google auth with the authentication API from expo. Although having tested both admob and auth in React apps, it would not work in React native, and a lot of time went in figuring out how to make the two work. Finally a prototype was ready in expo go. In which, one could login and view test ads.

But, there were obstacles yet to be surpassed. Both eas-builds and expo-builds refuse to open after installing APK on the app. Even after extensively searching for the issue, it is still not found.