DDJ-1000 OBS issue

Hey Guys,

I really hope you can help me out. 

I have the following setup.

My DDJ-1000 with 2 turntables on channel 3 and 4, CDJ-1000 and RB on channel 1 and 2.

- a dedicated desktop for Rekordbox connected on USB A

- Macbook pro I use for livestream connected on USB B

I set up my MacBook Pro according to the DDJ-1000 tutorial (https://forums.pioneerdj.com/hc/en-us/articles/360020707352) 

I get an audio signal in OBS but somehow I can't get the audio signal through to facebook live after I start streaming. I followed all the steps multiple times, but can't get it to work. I like to get it to work through USB. 

Can anybody help me out?