@john-l-clark If your image was from a machine that was in BIOS mode and the media to initially install was BIOS media as well, then the image is being deployed to the HDD/SSD with BIOS partitioning and not UEFI boot partitions. In this case the UEFI/BIOS would not consider it a UEFI bootable device (as it has no UEFI boot partition). Presuming your image is whole disk and not a single partition.
I have seen posts around about converting images that are BIOS to UEFI, but didnt pay much attention to them. If the process of setting up that machine with a new image isnt too much of a burden, that may be your best bet. Fresh install OS with UEFI settings/media, setup what you need and capture.
Hope this helps