toggle visibilty with lights for mobile

Hi,

I’m having an issue with toggling lights on and off for a mobile game. I’ve tried altering a bunch of settings and refuse to be defeated on this.

Essentially it’ll eventually be triggered by a box trigger to turn a light on in a given area but it’s not rendering on mobile platforms.
I have attached a gif of how I want it to look (and it not working) plus my current blueprint just to illustrate the aim.

Thanks in advance.

James and Friends