gotten all my interior navmeshes to finalize properly so that npc's can use the doors but i cannot get the exterior navmesh to work on the door. Is there a trick to this that i'm missing?

What do you mean? The green triangle wont appear? It's exactly the same as the interiors. Note: The green triangle is based on the teleport marker from the connected door, not the door mesh itself. If you place the teleport marker (The yellow/orange one) in a weird spot away from the door, the navmesh needs to be under that.

Ah, there we go. Thanks man!