Hi,
Thanks for posting in Q&A platform.
May I know if the Product key is Windows 10 Product Key? I would suggest you could click Get help now button in the following article or you could contact the product key sales for help. Thanks for your understanding.
https://support.microsoft.com/en-us/windows/activate-windows-10-c39005d4-95ee-b91e-b399-2820fda32227
Best Regards,
Sunny
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