Control Sonos Playback With a Plex App; Sonos Devices not listed

I am trying to control my Sonos devices with Plex app (IOS, with Plex Pass). However, if I try to connect my Sonos devices with Plex, the devices are not listed. I can only find and connect the devices with Airplay, not directly.
I am using latest Plex Software, latest IOS, Sonos S1 system.

Any ideas? Thank you for your help.

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