This is an old thread.
However, under the circumstance, it might be best to post here instead of starting a new thread.
Article by Microsoft.
Title : Reactivating Windows 10 after a hardware change
https://support.microsoft.com/en-us/...ardware-change
excerpt :
In Windows 10 (Version 1607 or later), you can link your Microsoft account to the Windows 10 digital license on your device. This can help you reactivate Windows using the Activation troubleshooter if you make a significant hardware change later,
such as replacing the motherboard.