@DTS Engineer Hello! I am currently building a remote desktop/IT administration suite and ran into the exact same architectural requirement for mounting synthetic USB hardware in user-space. I followed the excellent instructions you provided above to request the com.apple.developer.usb.host-controller-interface entitlement for our Host daemon. My Feedback ID is FB22776858 If you are still willing and able to help make sure this gets routed to the right place for review, I would be incredibly grateful. Either way, thank you so much for outlining the proper request format—it was immensely helpful!