AI following issues

I am having an issue where the AI is not following the Player. I am using a behavior tree to create this AI and the character blueprint is a child blueprint for the AI. I have already made a Navmesh as well but nothing is working. Perhaps you guys may know something?

Did you run behavior tree in AI controller ?

Yes, I think so, the first image with the AI controller has the behavior tree running in the blueprint

Probably not the cause here, but have you tried to run the BT first, then set the BBvalue?
Also, is there a particular reason for you to use “use blackboard” instead of just using this BB by default?

I just figured out the issue. I had the nav mesh located within a level instead of the persistent level, which made the mesh non existent thus making navigation for the AI impossible.