Note 1: You can only use the OEM key on one computer, OEM can not be moved to another computer.
Can you use an OEM key on another computer?
Nope. two things: OEM licenses cannot be transferred.
How many times can an OEM key be used?
On preinstalled OEM installations, you can only install on one PC, but you there is no preset limit to the number of times that OEM software can be used.
Can Windows 10 OEM be transferred to another computer?
Was this reply helpful? An OEM licence is bound to the device it was originally installed on, as it was provided by the manufacturer. It cannot be transferred to a new device, as it seems you have been told.
Can an OEM license be reused if you purchase a new computer?
The answer is yes, you can transfer it to a different computer or motherboard. http://personaluselicense.windows.com/en-US/default.aspx, “Can I transfer the software to another computer or user? You may transfer the software to another computer that belongs to you.