They don't show up on the map. Look at the signal "The Call"
First you need to use the portal in your room to convince them to join you. Then, you need to find sheila. Next, go to the handling room to "give" them the rooms. And finally go to the meeting room for #4 of the signal.
As a note the signal is visually bugged, so it wont change green when you complete the events, but you can still complete the signal.