[Ratzigong]

Up to yesterday anything works fine.
Trying to use MobileSheets today I got the message

MobileSheets ist unter Ihrem Konto derzeit nicht verfügbar. Der Fehlercode ist 0x803F8001, falls Sie ihn benötigen.

meaning Mobilesheets not available with my Microsoft account. Any hints what to do?

Thank you Lothar

Try resetting the windows store: https://winaero.com/blog/reset-windows-s...indows-10/ or try to delete unneeded devices in your Microsoft account if you have installed the app on many Windows devices.

Thank you for quickly answering. But resetting had no effect and numer of devices is one.
Could de-install/re-install MobileSheets be helpful?

Yes, I re-installed the app and after importing backup everything was fine again.