Windows product key after repair

[PhilippValet]

Hello, I just had my laptop with windows 10 in for a repair and now windows 11 is installed on it. It is now not activated and when I try to type in my previous product key it is not valid. So my question is: How do I activate windows 11 with my old windows 10 product key or how do I go back to Windows 10 as an alternative?I appreciate any help. Thank you.

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