HDMI Arc stopped working when connecting xbox

Forgot to give setup. Xbox is connected to tv directly via hdmi, then tv out to receiver via hdmi arc. It has always worked like this before with old xbox one. I tried connecting direct to reciever then pic to tv via arc, but then it says it is not 4k. Even
though reciever is capable of 4k arc passthrough.

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.

It is connected via hdmi arc directly to the soundbar. arc is just the shortform for HDMI audio return channel.

With your setup Atmos cannot.be setup through HDMI. For this to work the sound passes through your tv (HDMI ARC to TV and then TV to sound system) which you said your tv doesn't support. Btw the Xbox doesnt support ARC connections either. The only
way this is going to work is if it is supported by your tv as it must pass through your tv. Unfortunately optical connection doesn't support Atmos either.

can you help me? because I have connected consoles for soundbar up to hdmi 1 and soundbar connected to tv using hdmi arc and still do not have sound Dolby atmos, the same message pops up. write me what should I do? and is it the fault of the microsoft?

With your setup Atmos cannot.be setup through HDMI. For this to work the sound passes through your tv (HDMI ARC to TV and then TV to sound system) which you said your tv doesn't support. Btw the Xbox doesnt support ARC connections either. The only way
this is going to work is if it is supported by your tv as it must pass through your tv. Unfortunately optical connection doesn't support Atmos either.