Yes, check the app is updated and also check for System Updates.

Then close and reopen the app.

If that doesn’t work, log out on the app and log back in.

If that doesn’t work, uninstall and reinstall the app.

For your system to work, you can’t hold out on updates.

Same problem as above.  Nothing plays. Reinstalled - no change.  30 minute queue for assistance on the Australian help line.

Thank you.

I had to hold out on the app update because this year’s broke my system!

I have updated. I have closed and re-opened. I have logged out and logged in. If have uninstalled and reinstalled.

The problem remains.

Including Settings - Manage - System Updates - Check for Updates

?

Also if it looks like it is attempting to play, it could point to a network connection issue that just needs a refresh after multiple recent updates... I would suggest turning off the router and speakers at the wall, and turn off the phone. Then turn the router back on and let it fully reboot; then one speaker back on until it goes white, then the next and so on. Finally turn the phone back on and re-open the Sonos app.

Music service or local library? 

Tried all the suggestions above. My partner’s phone managed to get music playing.  Rebooted the modem.  That seems to have worked, although I think some of my “favourites” have disappeared.

Local library. Doesn't matter if it's through search or just clicking through the file system under Music library.