@Mike Doyle
Hi,
Do you mean you need to reactivate Windows 10 after the hardware change?
If so, activate the redeployed Windows image on your test machine will not be work.
Also, it will not be automatically activated when they are put into the original customer's machine.
If you change the hardware such as change the disk, system will not be reactivated automatically, you need to run activation troubleshooter manually. Link your customer's Microsoft account with Windows 10 license in advance is important
You should also consider the type of license. Windows 10 license based on an OEM license (came pre-installed on a PC) or Retail (purchased separately to a PC)
If it is a Retail license, then it will have transfer rights to a new Motherboard or PC, if it is OEM it will not.
For more information, please refer to the following article:
https://support.microsoft.com/en-us/windows/reactivating-windows-10-after-a-hardware-change-2c0e962a-f04c-145b-6ead-fb3fc72b6665
Hope above information can help you.
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