You could refer to the following link to find your Windows product key:
https://support.microsoft.com/en-us/windows/find-your-windows-product-key-aaa2bf69-7b2b-9f13-f581-a806abf0a886#:~:text=Generally%2C%20if%20you%20bought%20a,product%20key%2C%20contact%20the%20manufacturer.
Hope above information can help you.
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