OEM must enter the product key Windows 10 Pro, and activating before shipping it to you (if you buy PC with license Windows 10 Pro, of course).
in you Golden Image OEM use this product key: VK7JG-NPHTM-C97JM-9MPGT-3V66T
this default key set Windows Operation System, OEM_DM channel
if you environment use KMS server, use in Golden Image KMS this product key: W269N-WFGWX-YVC9B-4J6C9-T83GX