Windows Randomly Became Deactivated

[Microsoft Windows]

Hi,I have been running Windows 11 Pro on this PC since I built it almost two years ago, when I purchased a product key and used it to activate Windows at that time.Suddenly today, the Activate Windows watermark appeared on my screen, and I noticed that Windows was saying it was de-activated for some reason. I have tried re-entering my product key, but it does not work.Restarting my PC seems to have removed the watermark, but my settings screen is still saying that my Windows is not activated, and is preventing me from using Personalisation to change my wallpaper etc.Can anyone provide any help

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