def on_participant_connected(self, participant: rtc.RemoteParticipant):
        print(f"######################## Joining participant ########################")
        print(f"Participant SID: {participant}")

    ctx.room.on("participant_connected", on_participant_connected)

this is not working when i try to connect from web.

This example, https://github.com/livekit/agents/blob/main/examples/other/transcription/multi-user-transcriber.py, will fire the

participant_connected

event when you join from the web, e.g. from the agents playground