Can't add Apple TV 4K to HomeKit
I got my first HomePod mini recently and thought everything was essentially working, but I realized that my Apple TV 4K wasn't properly connecting with HomeKit because I couldn't select the HomePod as a default audio output for the ATV. It would play audio as a temporary output just fine though.
Playing around with the Home app on my iPhone, I noticed that the Apple TV was added to the room, but it always said it was "unavailable" even though it was on and functioning normally. I noticed that the TV OS wasn't updated, so I did that and rebooted everything, but still no luck. It just kept saying the Apple TV was unavailable.
I then tried deleting the Apple TV from the Home app completely, but now I can't add it back in. I can't add it as an accessory from the Home app, and when I try to add it to a room in the Apple TV settings, it gives me this message:
iCloud required
AirPlay 2 and HomeKit require an iCloud account
Gosh! You don't say?! Obviously, I have an iCloud account and I'm logged in just fine on the Apple TV. Actually, multiple users are set up for me, my wife and our two kids, and I'm wondering if that's causing a problem. I am selected as the current user, though.
I've also tried deleting and recreating the Home to reinstall the HomePod, but this time the Apple TV didn't get added automatically like when I first unboxed and set up the HomePod.
I've even tried swearing profusely in two different languages, but no luck, oddly enough.
Oh, yeah. When I first set things up, the Apple TV was connected via an Ethernet cable. When trying to add the Apple TV back to the Home after deleting it, I tried disconnecting the Ethernet cable and using Wi-Fi, but no go. The Apple TV is still on the network and working fine over Wi-Fi, but it's still not discoverable for HomeKit.
Any ideas?
TIA
7104X,