Usually, you'd activate Windows 11 (or 10) using the Settings app to ... replacing yourproductkey in the command line with ...

To find your Windows 11 OEM product ... Command Prompt If your PC has an OEM license—in other words, if you purchased a ...

Activating your Windows ... command. To resolve this first check if your product key is actually for the version of Windows like in the above case. However, if you previously upgraded to Windows ...