I was able to fix my problem by deleting the cache and data from the battle.net app itself (in the Android settings). After that, i got asked to accept my authenticator but did not loop back to the login screen anymore at least. I used my SMS Code and was in…
The chrome solution fixed it for me since i had that stupid browser disabled, funny how it didn’t work using firefox
Also got into the loop with Chrome on Android app.
Cleared Data of the app, no luck
I installed Firefox, switched default browser to Firefox, and then the login was captured, but then prompted for an authenticator app confirmation, which was impossible as it is that same app. But, selecting one of the options I was able to switch to SMS as 2FA, and using that I was able to log into the mobile app and re-enable the Mobile Authenticator function of it.
That works. And subsequently switching back to default browser being Chrome, the loop is not happening anymore.