Strange problem Apple Music not finding Sonos speaker via airplay

I have a really strange problem where my Iphone after iOS 14.2 can't find my Sonos speakers in Airplay.

If I use the Sonos app on my IPhone it connects to these speakers no problem but if I open Apple Music and go to the Airplay icon at the bottom of the screen it is only showing my Apple TV? To make matters more confusing I can connect to the speakers no problem on my iPad by tapping the AirPlay icon. It only seems to be a problem on my IPhone?

All was working fine until recently and I'm unsure if its maybe to do with the latest OS update?

Any help at all would be greatly appreciated.