@AdrianW There isn’t a -M option in the ipxe menu you posted.
To add a little clarity
- What were you doing when it threw this -M error? Just booting into the ipxe menu to register or where you trying to image?
- Do you get the same results when just booting into register or only when imaging?
- Can you get A computer to fail with the -M error message and then run Tom’s query again but with the mac address of the computer that threw the error like this
00:00:00:00:00== the mac address of the computer that generate the error.
I have seen sometimes users naming the image name with something like “Win10 -May2020” Might confuse the iPXE boot loader.