4 pin header

Hi All, I recently bought the Montech Fighter 500 case which has 4 pre-installed "rgb" fans. First, I thought the fans will just be regular 4 pin RGB fans, turns out that they are all static rainbow color LED fans (which I dont care much about because the case was cheap). However, I did realize...

I just bought be quiet pure wings 2 and when i connect it to my motherboard (MSI B450M Gaming plus) into the sys_fan2 header, it wont work. When i turn on the computer it spins up for a second and then just stops. Any suggestions are highly welcome.