How do I reactivate Windows 11 Pro after upgrading to version 24H2 from 21H2 seems to have messed someting up?

[Microsoft Windows]

Hi Microsoft Team, I have been using version 21H2 Windows 10 Pro (activated) on my laptop for over 2 1/2 years. Yesterday I upgraded to 24H2 an now My windows version is Windows and now my digital license or product key is invalid and so Windows cannot be activated. Could you please assist me in reactivating Windows? I am unable to find my product key but I have been using my Windows 11 which was installed and activated by my former Administrator after I purchased the laptop. Thank you for your help!

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