I was pretty sure that the product key was just fine, and for some reason, Windows could not recognize it. While it resolved for me quickly, here is the list of things to try. Restart Windows PC Check ...

Anand Khanse is the Admin of TheWindowsClub.com, a 10-year Microsoft MVP (2006-16) & a Windows Insider MVP (2016-2022). Please read the entire post & the comments ...