How do I set up Yarn for multiple NPCs

I want to use Yarn for more than one NPC all the tutorials online don’t seem to mention this.

Anyways so I’ve assigned each NPC with a Scene group and given them a string variable that reflects their dialogue tree node within Yarn. The dialogue never runs however.

Below I have a screenshot of my event editor, scene group, object variables, global variables and yarn setup:

Is there something I’m missing?