So get this... I have media players on my ANDROID phone that recognize my Xbox One as a DLNA device and I can play music from my ANDROID phone through my MICROSOFT Xbox One (and out my stereo speakers.)
My Windows 8.2 desktop recognizes my Xbox One on the network. I can connect to it with SmartGlass. I have the Media Monkey Media Player and you can right click on the volume setting and select playback devices between 'Internal Device' and my XBox One. I also have the app, 'Stream What You Hear' and it also gives me the option to select the Xbox as my playback device. Neither of these work like my phone does.
Because my Android phone can stream to my Xbox, we have confirmed, you do not need a Microsoft App to stream audio to the Xbox (it's using standard DLNA protocol)
Now maybe the knee jerk reaction of Microsoft support might be to point their finger at Media Monkey or Stream What You Hear and go talk to those guys. I think not.
Obviously the DLNA device detection is being handled by the Windows 8.1 operating system. If every single app I try using in Windows 8.1 that conforms with the standard DLNA protocol can't stream than this, but an Android Phone App CAN, this indicates to me there is an issue with Windows 8.1 communicating with the Xbox? (Yes, I can connect via Smartglass on Win 8.1)
Am I missing something?