Channels are the older communication method between devices, and haven’t been used in UEFN for some time. There is still a hidden island setting that can enable them though, and it seems that somehow this has become active for that map.
The simplest fix is to delete the island settings in your map (making a note of any overridden settings), and to then place a new one and reapply those settings.
Does your student remember doing anything to the island settings in this map, or did this island settings actually come from somewhere else (eg, copying it from a different project)?
Thanx for the reply. Yes, the student has been adjusting the Island Settings. I’ve sent them a link to this bug report so they can come here to get direct help.