If you are looking for an older version of Windows, check out the official list here. Lastly, these keys should only be used for temporary activation. Ultimately, you will have to buy a genuine ...
Note that each edition of Windows uses its own unique product key. For example, if you have a license for the Windows 11/10 Home edition, you cannot use it to activate Windows Pro or other editions.
This post will help you if you want to uninstall the Windows Product Key should you ever feel the need to. Yes, Windows 11 comes with a product key pre-installed on the computer’s motherboard.