Before deploying Trellix FRP without Self-Protection, the user needs to ensure that the 'Disable Self-Protection' and 'Uninstall Self-Protection' checkbox is selected in the Product settings.
When installing Trellix FRP client package in Self-Protection mode using third-party deployment software, make sure to add the keyword DISABLE_SELF_PROTECTION=1 on the command line.
For more information on Self-Protection configuration, see the Trellix FRP 5.6.x Interface Reference Guide.