Hi 
Before I activated 2FA in Nextcloud, everything was fine.
After I activated 2FA in Nextcloud, I cant open my tresor with the Android app.
With PC (Linux) it is still possible to open my tresor.
I disabled 2FA and Android app is working perfectly - disabled again -> error
I would be very happy with some help
Thank you
Ah lol, I solved it ^^
For everyone, who has the same problem:
You need to create an “app password” in your nextcloud settings.
Thats it ^^