I created a Unity, Windows 10 Universal project, with VR enabled, using a 2d template, and the only scene consists of a cube on either side of the screen. I set up the cameras so that I had a left and right for each lens, with each cube applied appropriately to its respective lens via layers. When I launch it in Mixed reality, it appears in a pinnable window but only the right cube is visible. I tried the same project for PC and both cubes appear in their respective eyes.
Did I do something wrong or is this not possible? It's the only way I can think of getting a true 3d SBS pinnable video player into the cliff House.