Usually, you'd activate Windows 11 (or 10 ... product key. However, if you're in an enterprise environment and you have a specific type of activation key, you can also use Command Prompt to ...

If when you attempt to upgrade your edition of Windows from Home to Pro but ... We can’t activate Windows on this device because you don’t have a valid license or product key.

Microsoft allows you to install Windows 10 or ... a product key" option and, just like that, Windows will be installed ...