Problem transfer in dynamic member in queue asterisk

Hello friends
I added dynamically the internal dynamics of my queues as follows:
"queue add member Local / 559 @ local-agents to 900"
Problems that arise Operators who respond to the queue can not call the transponder, TT options are also activated.
I concluded with adding /n as follows:
"queue add member Local /559 @ local-agents / n to 900"
But adding the /n report is wrong
I wanted to see another way?