Post-Windows update: Windows reports no product key was found on my device.

[Windows 11]

Hey all,Having some trouble with my Windows 11 Home. I updated my PC last night, and I noticed after an hour or so a watermark appeared telling me to buy a Windows license. The watermark also disappears on a shutdown or restart, but reappears after some time. I went into my Activation settings, and Windows now reports I have no product key for this device. I've had the computer since 2023 with no issues of the sort, and my purchase email of the computer itself shows that PC came with Windows 11 Home OED. I've tried checking my product key in cmd, but it returns nothing. No error message, liter

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