PXEBoot Error - Boot Sector Signature not found (Unbootable disk/partition)

Problem:
When trying to provision a host, Foreman picks up the host via its MAC address as required and the pxelinux.cfg stage is fine and then its fails with Boot Sector Signature not found (unbootable disk/partition)

Expected outcome:
The required vmlinux and img files would be found in /var/lib/tftpboot/boot and used to pxeboot the host. These files seem ok and have an owner and group of foreman-proxy

Foreman and Proxy versions:
Running version 1.23.0

Any suggestions would be much appreciated…

Hello, please provide exact error messages, preferably take screenshot of the screen with the error.