private JitsiMeetConference getConferenceForMucJid(String mucJid) {
   String roomName = MucUtil.extractRoomNameFromMucJid(mucJid);
   if (roomName == null) {
     return null;
   }
   return focusManager.getConference(roomName);
 }
  @Override
  public XmppChatMember findChatMember(String mucJid) {
    String nick = MucUtil.extractNickname(mucJid);

    return findMember(nick);
  }