Airplay is absolutely terrible on iOS12Just plain doesn't work. I've rebooted the whole system multiple times and it just doesn't work. Very disappointing and to be perfectly honest, Sonos shouldn't be allowed to say they are AirPlay compatible when clearly they're not!
AirPlay 2 Not Working, Disconnecting and Not Upgrading Jun 01, 2018 Update Your Vizio SmartCast TV to Get AirPlay 2 and HomeKit AirPlay 2 allows users to stream local content from their Apple mobile devices and Macs onto their TV screens, including multi-room streaming (if you have more than one compatible device). HomeKit How to set up a Sonos speaker to work with AirPlay 2 | iMore
Mar 17, 2020
Airplay Not Working? How-To Fix - YouTube Jul 12, 2016 Solved: Samsung Smart TV Airplay function not working Airplay is also only working on 2019 Samsung TVs (according to Samsung). They are working on fixing airplay for 2018 Samsung TVs. The reason you Apple devices need to be up to date is because it uses apples new airplay 2. Macs must be on Mojave and be airplay 2 compatible. iOS devices must be running iOS 12 and be airplay 2 compatible.
AirPlay problems on Mac: Top 7 issues and fixes
Airplay will not work with Sony TV - Apple Community Sep 17, 2017 Screen Mirroring Not Working? Quick Solutions Here Mar 17, 2020 Screen Share Using Airplay Mirroring – Zoom Help Center