https://www.techradar.com/news/new-windows-10-preview-makes-windows-mixed-reality-even-better

Microsoft has released a new preview build of Windows 10 which contains a number of improvements for Windows Mixed Reality, among other tweaks.

Build 17686, which has been pushed out to ‘skip ahead’ and fast ring testers, makes changes that include allowing Windows Mixed Reality apps to use the Camera Capture UI API to effectively take grabs of the virtual world.