SSAO seems to have no impact on my scene

I was trying to make areas receiving less llight appear slightly darker (soft shadow), so I thought of using ambient occlusion (SSAO) just like in https://threejs.org/examples/webgl_postprocessing_ssao.html, but it seems to have no effect, the area behind the furniture should be darker than the rest of the wall right?

onlyAO = true
screenshot%20(2)

onlyAO = false
screenshot%20(1)

I’m not sure the SSAO is working right now, see

Also see Ambient occlusion (shadows) on the ground

This should be fixed now, see