I've seen that over recent months, the ability to add Android TV devices into Google Home Speaker Groups has come and gone. This is a deal breaker for me as I really want to get a Philips Android TV! Now the new Chromecast has been released, is running on Android TV and is being marketed as supporting grouping, has anyone noticed if the ability to add other Android TV devices to Google Home Speaker Groups has returned?
Nope. It was there for a few weeks and worked perfectly on my Shield. And, for reasons Google, they took it away and never brought it back. Gotta love Google.