My Vizio TV is Chromecast-enabled. It is connected to a Nvidia Shield Android TV, which is also Chromecast-capable.

I can use the Google Home to raise, lower, mute, and unmute the volume of my Vizio TV.

Unfortunately, volume controls don't work on my Nvidia Shield Android TV. Occasionally, I can get the Google Home to mute or unmute the Shield TV. It's not a consistent experience, however.

To add to the confusion, I can use the Google Home to turn the Shield TV on or off. But I can't do the same for the Vizio TV.

If you have an Android TV streaming box or built-in TV, can you use the Google Home to control its volume?

I'm trying to figure out if this is a problem unique to the Shield TV, or if its a problem with Android TV in general.