Re-Activation of Windows after hardware upgrade / can't find my key

[Windows 10]

Dear all,I finally upgraded my system completely besides the SSDs among else to finally upgrade to Win 11 (as my older hardware would not allow that). To my surprise I found that Win 10 is no longer activated. After a quick search I found that this is apparently quite common after a motherboard upgrade (Reaktivieren von Windows 10 nach Änderung der Hardware - Microsoft-Support) My problem now is that I can't find my activation key for the life of me. I set up the system more than 10 years ago and if I remember

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