In case you've not yet seen these:
https://support.microsoft.com/en-us/windows/reactivating-windows-after-a-hardware-change-2c0e962a-f04c-145b-6ead-fb3fc72b6665
https://support.microsoft.com/contactus
https://support.microsoft.com/
https://support.microsoft.com/en-us/topic/i-changed-my-hardware-84f2c427-6c98-5103-be41-821db99a76a8
https://support.microsoft.com/en-us/topic/global-customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2
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Please remember to vote and to mark the replies as answers if they help.
On the bottom of each post there is:
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