Did an update on 4/20/18 and after I did it I could not get enemy nameplates for other players to show up. I am alliance and no horde players have name plates. Was working earlier on 4/19/18 but now they will not pop up. I pushed V to turn them on and off and still nothing. Have done everything I can think off to get them to show up but so far nothing. hopefully this gets fixed soon.

Nothing changed besides some config strings. The games' nameplate visibility settings are per-character - have you checked them? In general, check FAQs 1 and 2 here: https://www.curseforge.com/wow/addons/kuinameplates

(BTW you can still reply here when the issue is closed)