Hey,
I use the lighting node (not pro) wich was included in the the case to connect.
The first three fans that were included in the kit were connected to the first three connectors. When I connect the purchased fan to the fourth plug, it does not work. If I disconnect all the three fans that were included in the kit and insert the one purchased for the first connector in their place, then it works.
I am using an newest version of iCUE 4.