Novice Learning: Pathing through Buildings

Hi,

I’m attempting to create a pathfinding solution through buildings and I’m not quite sure why it is not generating a complete path on the first floor and second floor of building structures.

The layered line graph will path the stairwell but not the floors.
The grid line graph will path the roof and nothing else (it simply cuts the path around the entire building), this repeats with each graph type as well.

I’m not sure how to make it traversable, I’ve tried to make the nodes incredibly small and it still doesn’t like it. Could you please tell me what I should do next I’m attempting to do this with the procedural script?

Grid Line Graph example:

Layered Line Graph example:

Building Mesh (I can walk through the building with no colliders hindering me with 1st person controller etc.):
Building Mesh Collider