The problem may be detected during the Media Manager KBE build process, with errors such as this:
Access is denied
X:\windows\system32\>wpeinit
It may go through and map drives, but not be able to bring up the main menu:
Antivirus software can prevent the modification of the base WinPE environment included in the Windows AIK/ADK, resulting in a vanilla WinPE environment being uploaded to the SDA instead of a proper KBE with all of the specific drivers and KACE modifications.
Perform the following steps:
See the following Knowledge Base article on setting up a VM for building KBEs.