Check that all of the toons are in the same Jamba chat channel.
The default channel is something like JambaTeamIsOnline.
I like to change mine, just so there isn't the possibility of a conflict, with another boxer on the server, not that that is likely an issue with the Jamba permissions for team members.

And that the spelling of the names is exact.
If you want an exact name, and have used ascii code to generate a funky "a", like "à", naturally Jamba performs better if the toon has the same ascii "a" in Jamba as the toon is named.