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.
Can you use OEM key more than once?
Once an OEM licence is registered against the device (motherboard) it can be reinstalled to the same hardware as many times as you like.
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.