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Power was lost during a Windows 10update, and the system shows as unactivated after restarting
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 workin...
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.