In my Apple TV audio settings, I am unable to see my HomePod Mini as an option to set as my default audio output. Both the Apple TV 4K and HomePod Mini are running the last Software 14.3, and both are located in the same room and connected to the same WiFi network.
Apple TV 4K, tvOS 13
With Apple TV 4K the Minis aren’t supported to set as a default in the ATV Settings. That setting is now for home theater
with the big HomePods.
You can still use them via AirPlay:
to bring up Control Center. 
.With Apple TV 4K the Minis aren’t supported to set as a default in the ATV Settings. That setting is now for home theater
with the big HomePods.
You can still use them via AirPlay:
to bring up Control Center. .HomePod not showing up in default audio output appleTV 4K
