how to get edit variable from a blackboard from another blueprint

Hi so I’ve been developing this State Tree system for dialog in a project and I’ve made so it so when the player goes and interacts with a object in the world it’ll authorize them and change the dialog responses from the NPC, however i cant seem to change the isAuthorised Bool From the Terminal Blueprint which is being a separate object from the NPC. im using a Blackboard and BehaviourTree system to determaine the NPCs outputs.

any helps would be greatly appreciated, thank you