Volume Control On Sonos/Google Home

I have a Raspberry Pi 4 2GB with the Spotify Plugin and a Sonos speaker, when I try to adjust the volume the bar goes up and down, but nothing happens on the Sonos Speaker or Google Home Device.
I’ve tried casting to both to confirm the bug. Is there a way to control volume remotely, or does that just not work?

I see that it is possible to SSH into the Pi, but I doubt that would help.