WatchOS App using Firebase not working if started via Testflight

Hi everyone!

I'm currently developing a watchOS-only App which uses some Firebase functionality. If I build the App directly on my watch via Xcode everything is working fine. However if I upload it to Apple Store Connect via Product -> Archive and then install it via Testflight the App crashes.

After some testing I found out that the line FirebaseApp.configure() causes the problem. I'm not able to get any crash reports though so I don't know what error messages I get.

Did anyone else have this issue and know how to resolve it or does anyone have any ideas what I could try to solve this problem?

Any help is appreciated a lot!

WatchOS App using Firebase not working if started via Testflight
 
 
Q