Hyper-V Vm's with secure boot enabled can't boot to a Deployment Solution (DS) or Ghost Solution Suite (GSS) PXE server.
PXE-E99
The image's hash and certificate are not allowed
Ghost Solution Suite 3.x
Deployment Solution 8.x
Microsoft Hyper-v
Microsoft hyper-v virtual environments have higher restrictions for secure boot than a physical UEFI system and currently not able to be supported by GSS and DS pxe servers.
For GSS Upgrade to GSS 3.3 RU10 or better
For ITMS \ CMS Upgrade to DS 8.6.2 or better