Siri is know working on the appleTV. I did nothing but wait. It was an apple server problem.Perhaps it's just a coincidence, but I started having some serious issues last night, just before bed. Siri was unable to control my lights. I had to go into the home app and shut the lights off from there. After that the home app wasn't getting any updates from my devices.
This morning I restarted all of my equipment, routers, HomePods, Apple TVs, my iPhone, and my watch. Now everything is working very smoothly. In fact, it's much more responsive than it's been since I upgraded to that new architecture.
Maybe the recent updates they pushed out a couple of days ago tried to fix some of the problems and a full system restart was needed after that. I have three Apple TVs and two HomePods. I had manually applied the updates right after it came out, except for one of the Apple TVs. Perhaps that last device auto-updated at the time my problems started.
Siri is know working on the appleTV. I did nothing but wait. It was an apple server problem.
iPad and iPhone SIRI worked great but Mac, Applewatch, and appletv did not work. I tried all kinds of commands and nothing worked. Mac worked in a couple of hours, but the watch and appletv was restored later. If this was a problem with my network then iPhone and iPad should not have worked. Also I could stream movies perfectly fine when Siri was down. Siri does need an internet connection to work. Try turning off data on your iPhone and see if Siri works.Not sure how you've concluded that. But, my problem might have not been the same as yours.
For me, when I was having problems, I opened my Home app on my phone and noticed it wasn't getting updates from my lights. I'm convinced this doesn't use Apple servers at all.
16.3 came out this past Monday. Auto updates take a bit of time. Sometimes updates malfunction briefly and resolve themselves without a restart. I have no idea if this is what happened to you.
I'd be interested to hear more from you or anyone else to what extent Apple servers are involved in simple Siri commands used to control lights. The hubs we have are only required if one is trying to control devices from outside of the home. I thought internal access for simple Siri commands are processed on device and don't use Apple servers.
I'd be interested to hear more from you or anyone else to what extent Apple servers are involved in simple Siri commands used to control lights.