Maybe you will get an error like this during upgrade windows 11 home to pro in the activation settings: … blabla the product key is not valid, check the key and try again blabla… error: 0xc004f050.

In german: Der eingegebene Product Key funktioniert nicht. Überprüfen Sie den Product Key, und versuchen Sie es noch einmal, oder geben Sie einen anderen Product Key ein. (0xc004f050)

so this link worked for me: Windows 11 Pro Upgrade Failed Error Code:0xc004f050 – Microsoft Community

In the second option, the author said: plug off the network or deactivate the wireless, then type in the upgrade/activation field a generic (a temp. always working) key: VK7JG-NPHTM-C97JM-9MPGT-3V66T.

Then do a restart with unplugged cable or wireless. Then type in the new windows 11 pro key, plug in the cable and try to activate the stuff.

Worked for me.

The message in german: