Light Propagation Volume not working?

Hi I’m looking for some advice on what might be wrong with my LPV. I followed this guide here A new, community-hosted Unreal Engine Wiki - Announcements - Epic Developer Community Forums and it WAS working, and recently, it is not.
Specifically I’m talking about the settings that become available in the post process volume after following that guide to activate it.
I’m using this for a day night dynamic system for my level. Had some nice effects going but now it looks terrible.
Any advice great or small much appreciated :slight_smile: