OptionaldisplayThe participant's display name (participant.info.identity.user.displayName), when known.
The Graph participant id (participant.id) — stable for the participant's presence in the call.
OptionalisWhether this participant is the bot's own call leg (participant.isInLobby === false && isSelf).
OptionalroleThe Graph meeting role string ('organizer' / 'presenter' / 'coorganizer' / 'attendee').
One Graph call participant as the participants collection /
participantsUpdatednotification reports it.