I have been using my dock for about a month now, and always had sound. Last night I docked up, and no sound. The surface does not show the dock listed as an output device. Anyone have any ideas what I should be looking for.
Known bug as I had the same issue. Easy fix from Microsoft, undock the surface, unplug the power from the dock, plug the power back in to the dock and put the Surface 3 back in -- drivers and sound will be restored. Pain in the rear but fixes the issue.