As soon as I open the lid, Windows Hello with the external BRIO webcam will work right away, coming from cold boot, resuming from sleep or hibernation, it always work. The only way to use the BRIO webcam with Windows Hello is by opening the lid no clamshell mode, as soon as I close the lid no action in power settings when lid is closed, it is not going to sleep Windows Hello will be kind of deactivated and the BRIO webcam will not be detected. I have an external webcam Logitech BRIO - compatible with Windows Hello to be used when the SB2 is in clamshell mode connected to the Surface Dock with an external monitor, keyboard and mouse.