Purchased my new Dell laptop, I had Windows 11. Went through the Settings > Systems > Activation ... Upgrade via Microsoft Store. Paid my $99 and then I ended up with a "Failed to activate". Under System > Activation, it displays "Windows 11 Enterprise".
If you experience this, then the following steps should help you.
Here are the steps I followed to resolve this issue:
Go to this website and grab a Windows 11 Pro product key.
https://www.majorgeeks.com/content/page/list_of_generic_keys_to_use_in_windows_10.html
Then open a "Windows Powershell" (as an administrator) and run the following command:
slmgr /ipk ENTER-PRODUCT-KEY-FROM-PREVIOUS-STEP
Close and reopen "Settings > System". It now says - "Windows 11 Pro" and it is now activated.
Hopefully these steps helps others along the way.
Another useful link:
https://www.majorgeeks.com/content/page/how_to_downgrade_from_windows_10_enterprise_to_windows_10_pro.html
Cheers!
Visit me at MyThinkPond.com
Happy Activating!