How to activate Raytracing Ambient Occlusion?

“I’m trying to use Raytracing AO. I activated ‘use hardware raytracing when available.’ Raytracing shadows work fine, but when I activate AO in the post-process volume, nothing happens. How can I fix this?”

Screenshot 2023-10-04 231247

If you are using Lumen, you can’t.

Oh, Thank you!