I am inclined to say it’s flat as I do not know what’s VLAN setup 
Alright, then I am out of ideas. I am assuming you tried power cycling the ATV.
No I haven’t. What should I do?
Power cycle it? 
Just unplug and plug. It showed standby for a second then turned to ‘idle’ when it’s ON. Afterwards I put it to sleep and the status stayed as ‘idle’.
I think I might figure out where the problem is. I have always set ATV audio output to Homepod. The integration cannot work with that. I did a test to change it back to TV speakers and the states of ATV responded better.
Great! Don’t have Homepods myself so haven’t had the issue.
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