I use my xbox one s as my 4k uhd blu-ray player/gaming system as well. Make sure that you are using the soundbars hdmi cable and connect it to the ARC of your tv's connect-mini, and then connect it to your soundbars ARC hdmi port. Then connect your xbox one s hdmi out to either hdmi 1 or 2 on the soundbar. Whatever the source of your hdmi ARC on your tv is, you have to use the soundbars remote and change the source to either hdmi 1 or 2. If you already have your xbox on, wait a half second and then the picture should appear. Then go into the audio settings of your xbox and change to bitstream out and select dolby atmos....Make sure that you do not have any headphones connected then you should be good to go. I hope that my advice is helpful....good luck.
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