For some reason my Sonos systems became out of sync and won't update themselves and won't accept music push to them. It has been a nightmare to fix and Sonos is to blame. The only way to get things working was to create a whole new account and unplug all the Sonos speakers and slowly add them back one at a time by factory resetting them. Adding a service like Plex to one speaker for some reason doesn't carry over to the next because Sonos is terrible.