Hi Ray,
I am Sumit, an Independent Advisor here to assist you.
https://www.yourwindowsguide.com/2019/07/fix-pu...
Open Settings app by going to Start Menu.
Click Update and Security and Choose Activation.
Click Change Product key and type in the following generic product key: VK7JG-NPHTM-C97JM-9MPGT-3V66T.
Click OK.
Click activate product when prompted.
Content on the above blog is written by a Microsoft MVP so it is safe. However, do watch out for the ads.