Create an OSD variable for Secure Boot - _SMSTSSecureBootState
Create an OSD variable for Secure Boot called _SMSTSSecureBootState. It should have three values depending on the state and the currently running OS: Enabled, Disabled, NA. This can be used during a TS to determine if Secure Boot should be enabled. Currently, a TS variable has to be defined and set based on if the registry key exists or not.
Bruce Sa commented