I’m using version UE 5.3.2.
Post Process Volume Min/Max EV values are set to 0,0.
Unbound is checked.
Engine Scalability set to Epic.
In every case prior to now these setting were always set correctly so this was never a problem.
As indicted before the only way I did get the room dark was by setting the Intensity Scale in the Sky Light from 1 to .09.
But in HDRI Lighting, using only the sky light and Post Process Volume the environment goes darker but the rooms still do not get dark.
Hey @Qzapper!
So a few things, in order of importance:
Materials will matter here, so a darker one with more matte finish will not reflect as much.
Secondly, the post processing volume may have light scattering. The more of that there is, the more everywhere will be lit even in dark areas.
Try disabling Auto-Exposure (eye adaptation) or turning it down. This is so players can see in darker areas more clearly, and bright light isn’t so blinding- so if you don’t want that you can turn it down/off.
Try this stuff and let us know how it goes! 
SkyLight doesn’t cast shadows except for DFAO which requires medium globalillumintoinquality.
They’re not dark because no form of shadows are being cast. Either grab a directional light that will cast actual shadow maps(and tweek both skylight & directional intensity values) or get DFAO to work.
EDIT: If you go with DFAO(or both), you can change the way DFAO looks and behaves in the skylight settings.
