I think in fusion you have 3 options tab, basic , advanced and something else. Using the basic option and hitting Colour cycle should make all the Mobo sync together
Colour cycle didn't work? I did have a lead that I didn't know what it was for, at a guess I would say one end goes on the rgb header on the MB and the other plugs into some led strip, maybe that has something to do with it? I will see if I can find a picture of the lead and show you what I mean.