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I recently got an update for windows the night before, when I decided to check in the morning, my Windows activation wasn't working and it said, "You don't have a valid digital license or product key." After I checked my backup key and changed it and it still not working
Answer accepted by question author
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Open Settings > Update & Security > Activation > Click "Troubleshoot"
Open Command Prompt as administrator and copy-paste the following command followed by hitting the Enter key:
slmgr /ato
[If any recent hardware changes done to your system, then it can affect Windows Activation]
I did all of that like troubleshoot and Cmd command prompt and it is still not working.
edit 1: its now working using the old key code
