protected override async ValueTask <SynchronizedParticipants> InternalFetchValue(string conferenceId)
{
var conference = await _mediator.Send(new FindConferenceByIdRequest(conferenceId));
var participants = await _participantMetadataRepository.GetParticipantsOfConference(conferenceId);
var participantsMap =
participants.ToImmutableDictionary(x => x.Key, x => CreateParticipantData(x.Key, x.Value, conference));
return(new SynchronizedParticipants(participantsMap));
}