"Post Processing is currently disabled on the current Universal Render Pipeline"

I’m trying to add some post processing to my project, created from the core VR template. When I enable post processing on the camera, I get a warning that “Post Processing is currently disabled on the current Universal Render Pipeline.”

I looked around in Assets/Settings/Project Configuration and found a “Standalone Preset.asset” file that has Post Processing enabled. Other than that, I can’t find anything that would explain the warning.

Wondering if anyone can tell me how to enable it?