After installing the Windows 24H2 update I get the msg that my Windows is not activated and that I need to enter the Product key. Which I cannot find.

[Microsoft Windows]

I bought this computer in 2023 and have used it ever since without problems. But I have moved recently so my computer related documentation is in disarray. In December 2024 I was prompted to install the 24H2 upgrade and did so. The upgrade went fine, but then I noticed the msg that my Windows was no longer Activated. I need to enter the Product key, which I am unable to locate. How can I find it?E

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