Parallels 20 can't activate Windows 11

Hello,

Thank you for reaching out!
A Windows product key is a 25-character code used to activate Windows. It looks like this: PRODUCT KEY: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX
A Parallels Desktop product activation key is a set of 30-characters. It looks like this: XXXXXX-XXXXXX-XXXXXX-XXXXXX-XXXXXX

Note that Parallels Desktop for Mac does not include Microsoft Windows. A license for Parallels Desktop for Mac is the license key that allows you to activate only Parallels Desktop, the license key isn't supposed to activate Windows.
A Windows 11 Pro license key can be purchased from the Microsoft website here: https://www.microsoft.com/en-us/d/windows-11-pro/dg7gmgf0d8h4

You may consult this article for more details: https://kb.parallels.com/9003

Thanks