Tilemap Collider 2D not being created at runtime

I am making a game which involves tiles being built in runtime (walls, fences, etc). I have a tilemap for tiles such as ground tiles and a tilemap which has a Tilemap Collider 2D attatched. If I draw in my wall tiles before-hand with the tile pallet the collider works fine but when I use wallMap.SetTile(location, wallTile) a collider does not appear to be added.

Any ideas?

Thanks