Jamba and 2 computers????

[Owltoid]

I don't think Jamba has a clue if you're playing three accounts on one computer or three different computers. It sounds like your main isn't included in the same team list as your other toons.

[MiRai]

I don't see why this wouldn't work? Jamba communicates in game over the channel you specify. It's the same way that WinterTime or any other global mod communicates across the server with people that aren't on the same computer.

[Jafula]

You need to make sure that the main is in the same communications channel as the others. Check to make sure the channel name and password in Core: Communications on all toons are the same. Then logout all toons and log them in again.