No AO in Lumen

I am using Lumen as Global Illumination and Reflection. Scene is standard scene with SkyLight, SkyAtmosphere and Directional Light. Have a PostProcessVolume that is set to boundless. Two Sided Distance Field Generation is enabled for all surfaces.

I am unable to see any sort of ambient occlusion in viewport. Even when I render with Movie Render Queue, there is zero AO.

Is there a way I can fix this? Thanks!

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