I downloaded the Sound Phone app for $3.99 from the Apple App Store for iPhone.  $3.99 is small ransom to pay after Sonos has held my equipment and music hostage since their disaster release from early May 2024.  IT WORKS!  Sound Phone instantly recognized my Sonos Amps, speakers, and all of my music sources.  The volume latency issues are resolved.  The app is stable.  Imagine, consistent streaming!  I can’t guarantee it will work for you, but the developer of Sound Phone is a hero to me!