I'm a idiot. Thought that was the reset button but its the RGB button.
** Still won't sync but at least I can just set it to the color I want now. Thanks for help both of you.
It claims to be able to sync with RGB motherboards but it doesn't. I'm using a MSI z370 Tomahawk and MSI is listed to be compaitable but is not working. Mystic Light does not change the color of the case fans even when I choose extended.