Did you register the trigger for players in the INIT section?
Are you trying to use the character creation dummy?
I gave it a shot myself, I'm having trouble getting the "Dummy" character to teleport on entering a trigger. But any placed characters with the player checkbox ticked are teleporting....
I've had no problems using teleport via an item, as all my levels use doors for area transition. So I hadn't tried a trigger to this point.
Have you tried using:
PROC_Helper_SafeTeleportTo(_Player,TRIGGERGUID_LL_1_StartPoint_b51a343a-3fd0-4673-8cfd-f7b123574f7e,"",1);
Or how about:
CharacterTeleportPartiesToTriggerWithMovie
But just put in blank strings ("") for the movie and event).