What apps are you guying trying edge lighting with? I had it going when playing Samsung's Samsung Music app, but I disabled it. Just enabled in after reading this thread and mine is working. And yes, after the update, which I did earlier this week.
How do you enable edge lighting for notifications?
It’s in your settings under display, then edge screen, edge lighting. There’s also a quick toggle for it in your notifications panel quick settings. In the edge lighting settings you can manage which apps you want to use.