Brilliant! worked first time

Upgrading from 11 Home to Pro. I just selected 'Change Product Key', entered the new Key, it upgraded and bingo all good. Thanks.

Key worked fine. No problems.

6th valid key purchased through GO instant dl
No issues upgrading from W11 home OEM during setup,BEFORE activation on a brand new laptop.

Initial error upgrading activated W11 home OEM to W11 pro OEM.

Easy fix though...
Change key to generic W11 pro first then use GO key.
Boop all good.
Pretty sure it was a generic KMS pro key first.
NICE. No complaints.

I bought a win 11 pro oem cd key and it worked as expected. I instantly received the key and could activate windows, I have nothing to complain about!