Tried all sorts of settings and can’t seem to create any noticeable Ambient Occlusion in Unity 5.1.2. See attached screenshot.
Are those spheres and cubes set to static?
Yep
Can you show me your lichting settings?
Those are included in the screenshot on the right.
I once set the ao to 10 and nothing no ao at all. Can you try to set it to 3 and bake again?
It only works with Baked lights. Select the light and change it to Baked.