Xbox one connect to sound bar via hdmi arc

I also have the same setup. Xbox Series X conneted to Samsung TV via HDMI. Samsung TV connected to a Klipsch sound bar via HDMI ARC. Experiencing the same issue described by many others.

After reading some other forums, I changed the Video setting on the Xbox One from "Auto-detect" to "HDMI." After doing this, I was able to select "5.1 uncompressed" from the audio menu on the Xbox without getting an error. However, at
this point, I was getting no sound. After a few hours of frustration (I thought it might be an HDMI handshake issue), I decided to hook my Xbox One directly to my sound bar via an extra HDMI input on the sound bar and then hook the sound bar up to my TV using
my HDMI ARC input. I now have surround sound!

The downside is that when I switch HDMI inputs on the TV, I have to switch inputs on the sound bar as well. I thought the promise of ARC was that the TV would act as the switcher for audio.

I won't complain at this point, but any thoughts on why I would need to hook the Xbox One directly to my sound bar for surround sound to work vs. hooking the sound bar up to my ARC input? When I didn't have a direct HDMI connection between the Xbox One
and the sound bar, I could get stereo uncompressed sound just fine. Is it a limitation of the TV? Could it be an outdated HDMI cord? Any thoughts appreciated.

I’m very happy with mine too, however, when I use the sound bar for pass through and select arc I get no sound or picture and have to run it through the hdmi option. If I connect the Xbox to the tv hdmi 2 and then the sound bar to hdmi 3(arc) I get picture
with no sound despite all settings suggesting that it should work. If I use an in built app on the tv and watch it through arc it works perfectly. All mildly frustrating.

Found this:

1. Update firmwares for TV, XB1S & Sound bar.
   
2. XB1S HDMI OUT (to TV) goes to Sound bar HDMI IN. (DOES NOT GO TO TV)
   
3. Sound bar HDMI ARC OUT goes to TV HDMI ARC.
   
4. TV AUDIO set to PCM. TV VIDEO set to ARC.
   
5. Sound bar audio set to HDMI IN. (NOT HDMI ARC)
   
6. XB1S Video set to 4K UHD.
   
7. XB1S Audio set to ATMOS.
   

*Most importantly, XB1S HDMI OUT (to TV) DOES NOT GO TO TV, BUT GOES TO Sound bar IN! XB1S HDMI IN Should NOT BE USED!

Can you provide an update for your situation? I tried the optical connection first and it worked fine, but hooking everything up using HDMI is not working for sound. Here's my setup...I have a UHD Samsung TV, Cisco cable box, Xbox One, and a Vizio S5451w-C2
sound bar. The Vizio sound bar has a HDMI ARC connection option. I have my connections set up as follows ALL WITH HDMI CONNECTIONS::

Cable box --> Xbox One --> Vizio sound bar (HDMI Input) --> Vizio sound bar (HDMI Output)--> Samsung UHD TV (HDMI ARC)

I can get video just fine using this connection, but NO sound. My TV settings are good to go, but I'm wondering if there is some Xbox audio setting that is the final piece to this puzzle. Currently, my "HDMI audio" is set to "5.1 uncompressed" and "Bitstream
format" is set to "DTS Digital Surround". Does anyone know if these are correct or if there is something I'm missing?