Activate Windows notification appeared after last update

[Microsoft Windows]

Hello,The "Activate Windows" watermark started appearing on the bottom right of my screen after the last Windows Update (might be related or not).Going into the settings, I see an error message indicating that I "don't have a valid digital license or product key", with the error code 0x803FA067. I tried troubleshooting, as the message suggests, but to no avail.The problem is that I have a valid Windows license though. I still have the original box, with the CD and key number -- although I think the key has since changed since the system was updated from Windows 10 to 11. In any case, I didn't

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