How can i broadcast/stream audio from rekordbox using my DDJ-RR ?

 I normally would live stream using facebook live. In order to do this you have to go through a program like OBS (Open Broadcaster Software).

I setup rekordbox with the PC Master out activated and i have my headphones plugged into my DDJ-RR so i can hear cue'd tracks. The master output is going through my Focusrite Scarlett 2i2.

In OBS i select the Scarlett audio but nothing comes through?