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I have updated my sonos one speakers. As part of the update I was informed that Airplay will find the speakers and allow playback via Airplay. The speakers are not visible on Airplay despite following the steps on the Apple website.
iPhone 5s, iOS 12.0.1
There is nothing more to it. All AirPlay compatible output devices should be discoverable on the same network, 
, both for in-app AirPlay on iOS, as well as the Audio Card in Control Center. How to AirPlay audio - Apple Support
Maybe your router blocks some network traffic that is used for discovery? (Port 5353 UDP is used by the Bonjour discovery protocol.) Other devices on your network would be affected as well, if such is the case.
Are your Sonos speakers connected to the same home Wi-Fi network as the iPhone? E.g., if the iPhone is on cellular data but not on Wi-Fi, then it will not see AirPlay devices.
Yes, the iPhone and Sonos are connected to the same Wi-fi network but Airplay still does not find the speakers.
My sonos one speakers will not connect following the above steps - I have updated the sonos but they are not displayed over airplay
