I feel like I’m becoming a pain, I keep posting issues, sorry.
Today I tried adding sun brightness to an hdr with fog on, was hoping for a hazy sunset but got some crazy result, kinda awesome but my client may not agree.
Since you have normalize brightness checked, use the lux slider to brighten the hdr/skybox.
Correct - you’ve set the skybox brightness to almost 0, therefore it’s black since even a 16% bright sun is much more brighter.