[issue] The sound in the browser is not stereo.

same issue. Also vizio sound bar. no problems with DTS or stereo

Hmm... can you share with us what your sound setup is? I have heard from folks who had a similar issue (hearing music and certain sound effects but no voices during cutscenes) and it turned out their Xbox was outputting in Surround Sound, when they actually
only had a stereo setup. By flipping their output to Stereo, it fixed the issue.

Let me know!

Yes the controller + adapter is up to date. The problem seems to be connected to how the console handles the hdmi output. It seems when the connection is not present anymore the console disables the output.

If somebody could test this on their console it could be really helpful. Basically change the input on the TV or Receiver the xbox is connected to and check if the headset still plays the xbox audio.

Maybe the issue is connected to my HDMI receiver and how it handles hdmi-switching. I also tried to disable HDMI-CEC and ARC but the problem still exists.

I hooked my Turtle Beach x12's to my xbox one via the Headset Adapter. Followed MS instructions to a T. Sound works, controlling game and chat at same time is very annoying. My issue is when I do have sound I cant turn the BASS BOOST up, so i have a $70
pair of headphones, a $30 headset adapter and now am stuck playing games that sound like crap due to no bass. How much more money will I have to spend to play games on my new $350 xbox one? I wish i had stayed with my xbox 360 as i never had a single issue.
GET IT TOGETHER MICROSOFT/XBOX, we spend money on your product instead of SONY for a reason, im not sure how long i can keep having issues without switching sides and consoles.

Did you run an update on your controller with the adapter attached? If not then head to Settings>System and do that.