Oct 11, 2017 Surface Book just updated with:
Surface - System - 8/1/2017 12:00:00 AM - 184.108.40.206 and
2017-10 Cumulative Update for Windows 10 Version 1607 for x64-based Systems (KB4041691)
immediately after updating it reboots and then Windows Hello at login says it can't turn on the camera.
Settings app now says windows hello not available on this device, but it just worked right before the update
known issue? any fix?