Answered
Volume controls & functionality gone in new app update
Best answer by Stanley_4
First run another upodate cycle.
Then verify all your Sonos are on the latest versions of the software, under Settings - About.
If they are power them all down, reboot router and Controller and then power the Sonos back up.
https://support.sonos.com/en-us/article/release-notes-sonos-app-updates
https://support.sonos.com/en-us/article/release-notes-sonos-system-updates
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