Particle System help

Just getting started with this and please direct me if there is a better place to ask this. I am using the Cesium Map Plugin and tried to drop a particle system on the map using this tutorial: Magic Aura Effect - Particle System - [UE4 Tutorial] - YouTube

Somehow it is interacting with the CesiumSunSky Object/Actor because it is just a ghostly black and white when I drop it on the map. If I turn down the Sun or make it night it shows up perfect. How do I make it not interact with the light? I already tried making the materials “unlit” but that didn’t change anything.