Something here may help.
https://support.microsoft.com/en-us/help/10749/windows-10-find-product-key
--please don't forget to Accept as answer if the reply is helpful--
This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
Previously on my account, I had an abundance of Windows 10 keys available to me for personal use. I recently built a new PC and would love to use another Windows 10 key, but I am clueless as to where the locations of these keys are.
Something here may help.
https://support.microsoft.com/en-us/help/10749/windows-10-find-product-key
--please don't forget to Accept as answer if the reply is helpful--
Hi, @John Matte
We have not heard from you in a couple of days. Please post back at your convenience if we can assist further
If any reply is useful for you, please accept it as answer.
Best Regards.