Unable to locate configuration file

For some reason, when PXE booting servers I’m seeing

Unable to locate configuration file.

Within the MAAS server logs (/var/snap/maas/common/log/rackd.log) I’m seeing the following

Blockquote2022-07-28 17:14:42 provisioningserver.rackdservices.tftp: [info] /ldlinux.c32 requested by 10.166.96.130
2022-07-28 17:14:42 provisioningserver.rackdservices.tftp: [info] /pxelinux.cfg/44454c4c-3700-1033-8042-c6c04f314d33 requested by 10.166.96.130
2022-07-28 17:14:42 provisioningserver.rackdservices.tftp: [info] /pxelinux.cfg/01-e4-3d-1a-80-d4-c0 requested by 10.166.96.130
2022-07-28 17:14:42 provisioningserver.rackdservices.tftp: [info] /pxelinux.cfg/01-e4-3d-1a-80-d4-c0 requested by 10.166.96.130
2022-07-28 17:14:42 provisioningserver.rackdservices.tftp: [info] /pxelinux.cfg/0AA66082 requested by 10.166.96.130
2022-07-28 17:14:42 provisioningserver.rackdservices.tftp: [info] /pxelinux.cfg/0AA6608 requested by 10.166.96.130
2022-07-28 17:14:42 provisioningserver.rackdservices.tftp: [info] /pxelinux.cfg/0AA660 requested by 10.166.96.130
2022-07-28 17:14:42 provisioningserver.rackdservices.tftp: [info] /pxelinux.cfg/0AA66 requested by 10.166.96.130
2022-07-28 17:14:42 provisioningserver.rackdservices.tftp: [info] /pxelinux.cfg/0AA6 requested by 10.166.96.130
2022-07-28 17:14:42 provisioningserver.rackdservices.tftp: [info] /pxelinux.cfg/0AA requested by 10.166.96.130
2022-07-28 17:14:42 provisioningserver.rackdservices.tftp: [info] /pxelinux.cfg/0A requested by 10.166.96.130
2022-07-28 17:14:42 provisioningserver.rackdservices.tftp: [info] /pxelinux.cfg/0 requested by 10.166.96.130
2022-07-28 17:14:42 provisioningserver.rackdservices.tftp: [info] /pxelinux.cfg/default requested by 10.166.96.130

We have an external windows DHCP server with options 66 and 67 configured
option 66 is set with the IP address of the NIC that sits on one of the network interfaces
option 67 is set to “/pxelinux.0”

running MAAS version: 3.1.0-10901-g.f1f8f1505