I have Apple TV and HomePod on same network, it shows that they are connected on the settings of the Apple TV but no sound from the HomePod.
Apple TV HD, tvOS 14
Reboot (power cycle) the router, Apple TV and HomePod, then try again. Presumably all devices are connected to the same Apple ID? You don't want to be using any wireless isolation feature your router may have.
tt2
Followed these instructions at outset, but does not work.
Still not working except with Apple Music app, not Pandora or You Tube.
Try updating those apps or delete & reinstall
Make sure also your Apple TV software is up to date
It is possible 3rd party developers may choose not to support AirPlay.
tt2
Apple TV not playing through HomePod
