SOLVED: Android App not connecting anymore

[swp]

So today I had the same problem as OP. The Jellyfin Android app suddenly stopped working. The app just shows a black screen. I tried restarting Android, but no success. But the server is running and I can access Jellyfin via the browser. And there are no logs on the server either.

I fixed it by clearing all Jellyfin app data and cache in Android: Settings > Apps > Jellyfin > Storage > Clear data + Clear cache. After that you have to log in again, but everything worked again after that.