Android App not loading on any android phone

Runtime Version: 3.1.8
Build 411012
Platform- Android

I built my app, downloaded it to my desktop and then copied it onto my Samsung phone AND tablet and was able to install this app. But when I try to open it, it only shows a white screen with a spinner (loading sign).

I gave all permissions, restarted my device and tried to open and also uninstalled and re installed the app but issue persists.

Please help me debug this. Thanks in advance :slight_smile: