Ndisplay

Hi
I can’t get Ndisplay to join the multi user session , any ideas ?

setup is : two workstaions , one node (led wall)
one workstation is the editor and the other is running the Ndisplay on the Switchboard linstener.
I can join the multi user session from both workstations , but when launching the Ndisplay the listener bickes it up but it dosent join the multiuser session.