It does work in 4.23 by enabling through the CVars. However, it does not work very well with raytracing (surprise). So once SSGI is enabled, it disables your raytrace Ambient Occlusion and replaces it with its own screenspace AO - however there doesn’t seem to be a parameter to tweak that as all regular AO post process effects doesn’t change anything. The SSGI looks amazing, but it’s just not usable, basically like raytracing. In a couple of releases, combining these features will be very powerful I hope.