Xbox one x problem: Why can't open Dolby Atmos for home theater?

Why can't I open Dolby Atmos for home theater? As soon as I selected it, it advises me to check the connection. Is there something wrong with my line? I have a 9000f TV + ht-z9f and z9r, an HDMI out port connected to the TV HDMI (arc) on the stereo, and an HDMI out port connected to the TV HDMI2 on xbox one x. Where do I go wrong? Why can't I open the home theater?
 
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