The computer was working fine, but there was a power outage while the system was updating. After restarting, it displayed a message saying that Windows is not activated. This computer has been working normally for three or four years and has never had any activation issues before. Could the power outage have caused the activation to fail? How can I reactivate it?
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The update process was interrupted while Windows was writing to system files, and the activation data got corrupted or partially deleted. One Microsoft support thread specifically mentions that the Windows 11 24H2 update has been known to deactivate certain license types. If that was the update your computer was installing when the power went out, it explains everything.
Ensure you're signed in with the same Microsoft account you used when activating Windows previously.
I think you got in the least trouble. Somebody actually corrupts their ENTIRE OS to outages. You can contact support or just buy a new key. Be sure that no outages happen while BIOS or Windows is updating. Have a great day.
