How can you add Firebase to this project?

[Dararii]

Hello, I just want to know how can you implement Firebase to this Instant app project, I have tried thousand times by my self but the Firebase integration with Instant app, except Firebase analytic, are still stuck. the problems comes start with "No default activity found" and The firebase cannot be initialized. https://stackoverflow.com/questions/48715851/using-firebase-on-instant-app-on-android

Please help. Thank you.

[nishtahir]

This project already has firebase included. See this line.