reconnect the room, when the person disconnect

Hello guys, can you help me, I have a problem: when the player who is not a room owner enters the room and loses connection, when reconnecting, ActorNr is changed, the first input is 2 , after reconnecting to 3, is there a way to change that client's ActorNr to 2 as the first time connecting (I did custom authen, but don't know how to set ActorNr to a value connect head)