Look for KB971033 installed in "add/remove programs". It's a Windows "update" that goes to re-check the validation every 90 days. I suspect it failed to get q check on it's schedule, the KB did it's job, and you need to re-certify windows. It happened to us on air-gapped servers one too many times so we deleted it.
If this is the case, (check first), re-certify windows. After a reboot, go to add/remove programs, uninstall KB971033, then go to windows update. Run an update check and it will re-list that KB. Right click the KB, and select "Hide Update".
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