The Xbox One USB TV Tuner doesn't seem to be able to passthrough 5.1 audio from tuned in channels. It only outputs Stereo from all TV channels (this outputted as 5.1 w/ only the front left and right speakers having sound; another issue related to system audio handling). I verified this by Tuning the same channel on my TV which is connected to my receiver via optical. The show was broadcast in Dolby Digital 5.1 and the center channel had distinct voices. Watching this same channel on the XBox One USB TV Tuner outputted the sound only via the left and right channels(despite the XBox being set to output Dolby Digital 5.1; which it does for games).
Not sure if this is really a support issue as much as a bug/issue that needs to be filed. Anyone have any idea how I could file a ticket to track this?