Apple TV - no HomeKit Hub

Called Apple Support. The problem was that the AirPlay 2 support was not activated. To get that activated, had to navigate to AirPlay and HomeKit then click on Room. That brought up a screen on tvOS prompting to activate BlueTooth on my iPhone. It took some work [1] to get that screen to go away, i.e. for the iOS to tvOS BT connection to occur but eventually the BT prompt screen did go away and then my HomeKit hub was shown on the AirPlay and HomeKit screen. It took another half hour or so for the iOS HomeKit app to connect, i.e. for HOME HUBS to appear on the Home app's screen which appears when you tap the house icon and for something other than a help screen to show up when pressing the Automation button.

[1] I don't remember exactly what magic finally worked. I think it was closing out and restarting the Settings and Home apps.

I tried signing out/in of iCloud on my iPhone with no luck. One of the things I did between when it worked and now is that I upgraded my software. It's now at 13.4.6 (17L570). Maybe the prior version worked better? I've since done a couple of resets since then. I don't plan on using Apple TV for anything other than the hub function so I've turned off a lot of features. Is there one of those features that needs to be turned on?

Another factor which may or may not come to play. I previously used an iPad as a hub. It was on my wife's iCloud account and I was a guest. However I've turned off that hub in that iPad's settings. And this morning when that iPad was not on the network I tried a restart of the Apple TV and still no joy. And prior to the latest software update hubs were shown in the list so I don't think the prior use of the iPad has anything to do with the issue but I thought I'd mention it.

BTW, How do I contact Apple to get help with this?

Another thing that is interesting is that this Apple TV was associated with another user before I cam into possession of it. The reset should have removed that association but maybe it didn't? Maybe a reset and re-setup with a new iCloud account did not propagate into Apple's control software and the device is still associated with the prior owner. Just a guess.

Hi, Yes both are signed into the same iCloud account.

My HomeKit device is iPhone 6 with iOS 12.4.7 and the Apple TV 4K tvOS is 13.4.6. Are they compatible?