Hey @c-attack, It is a standard 4 pin Corsair RGB Fan header. Shows up as a LL Fan when Commander Core XT auto detects it in iCUE for RGB Control. I am also having issues getting this cooler to work when connected as instructed to specifically Asus motherboards. I have managed to get aRGB to work on a Gigabyte board. Confirmed it is not just Asus Armoury Crate as well by testing with SignalRGB. Whatever it is, it is quite strange.
Picture for your reference: https://imgur.com/Z6o2w4G