If anyone asks (including your device) - do NOT leave Sonos Version 16.1..
I have NEVER seen such a cockup.. I trusted Sonos; always installed the latest release (please no speeches about caution or not fixing what's not broke) STILL, there were a lot of Sonos users suckered.)
Do not update to the latest version until you know for sure that it won't ruin your life (or at least your music setup).
On the Sonos users' site some (IMO) crazy github/blahblah for Android users to revert but we IOS people - fuggeddaboudit.
Anyway the solution: a small company I think in Denmark with an App, SONOPHONE, available in the MAC store (for Ipad and Iphone) abt $3 (US).
I am not - well, maybe I am in a way, a person invested in TECH...I often think of other stuff - but this took about 5 seconds to get working. (I have 1 B2 and one SONOS).
Pat M