I have numerous Sonos speakers throughout the house, all with individual names. I have also added them all to a group called "All Speakers". I can get Alexa to control any one speaker individually, but when I try to get her to play the same music on all speakers throughout the house by directing her to play on "All Speakers", she says she understands, but it doesn't work. It just ends up playing on one speaker. Oddly, when I then tell her to stop playing music, and then repeat the request to try playing on all speakers, she will end up playing two different songs on two different speakers.