Windows 11 24H2 update disables my windows activation.

[Microsoft Windows]

I have a pretty old system build around 2018-2019 and was running Windows 10 pro. When Windows 11 rolled out, I got a free upgrade, downloaded and upgraded, and had no problems with my Windows key up until now when I updated to 24H2 where after updating, it deactivated my Windows.My problem now is, I had an OEM key and any written/printed copies of the key are long gone.When I try the cmd/powershell/registry ways to get the key it doesn't give me anything except for the regedit one where I could actually find a key BUT, when I try to choose change product key, Windows won't accept the product

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