Changed internet and laptops (connected via wifi) are no longer being detected by the master PC

Hello. I just upgraded my internet speeds (yay). I have 5 computers connected via multiplicity... 2 PC's (wired via ethernet), and 3 laptops, connected via wifi. I've been running multiplicity for about a year now, no issues. Now, my 3 laptops are not being detected. They are all connected to the new internet, but multiplicity seems to not be picking them up. Any idea why?

(also - these are new laptops and don't have ethernet ports so I can't wire them)