Why won't my Apple TV 4K work as a HomeKit Hub.

• Please verify in the Home app on iPhone or iPad, that the Apple TV box is assigned for the intended home and room. That would then push this information through iCloud to the settings on Apple TV.
• Also verify that the Apple TV box has been signed in for with the Apple ID account for HomeKit administrator use (Settings﹥Users and Accounts﹥ᴅᴇғᴀᴜʟᴛ ᴜsᴇʀ﹥ᴀᴘᴘʟᴇ ɪᴅ﹥iCloud: «…»).

Set up your HomePod, HomePod mini, Apple TV, or iPad as a home hub - Apple Support

I’m having the same general issue. I can reset the system and log back in through a complete reset, but it is only a temporary fix.

I think this is a software bug impacting the connection between the hub and the servers allowing for the iCloud features. It seems to be having authentication issues. The system claims it isn’t signed into iCloud, but the bug doesn’t impact the other iCloud and AppleID dependent features. At least I have no issues accessing purchased content, AirPlay 2, and even local access to the HomeKit accessories.

The error started upon release of tvOS 17.4, and it has not been fixed in subsequent updates.

having same issue, tried all recommended steps, can't figure this out. could it be a hardware failure within the Apple TV?