Appletv mute issues

New appletv 4k, harmony hub, marantz receiver. Appletv hdmi plugged into marantz.

When I power up and get to the ATV home screen I press mute (mainly because my wife doesn't want to hear sports crowd noise). Then I open channels and tune to the station I want. The problem is the TV unmutes automatically. Today it did the same thing and I muted a second time when it happened. Then it unmuted by itself again. I am just trying to figure out why channels is fighting me with the mute button

Recent thread on this here, if you haven’t read it already: