Sudden Appearance of Windows Activation Message

[Windows Server]

Attached is a screenshot of a message that has suddenly appeared on my Windows 10 computer. I haven't done anything to the hardware or software. I keep Windows Updates up to date. I have run the troubleshooter as suggested in the screenshot but that hasn't helped. I don't have the product key readily available to activate Windows. The computer seems to be running okay even with this message but obviously something has gone wrong. Anyone have any ideas why this would just pop up out of nowhere?

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