Ambient Occlusion not working with Orthographic camera

Using the Unity Post Processing stack (from the asset store), it seems like the Ambient Occlusion setting only works with a Perspective camera. I haven’t come across any documentation stating that this is the case or that it lacks support for Orthographic.

All the other settings in the stack seem to be working in both Projection types.

Is this a bug, or something I’m not doing right or understanding?

I set up a simple scene in unity to test this, and the ambient occlusion worked fine for me with the camera in orthographic mode. Can you provide a screenshot of your camera settings and scene?