Cubase 8 or 8.5 - Artist Mix not working / El Capitan 10.11.2

I’ve upgraded the software and firmware from AVID, and have an up-to-date versions of Cubase, but it doesn’t see the hardware at all.
I’ve tried on Ableton Live and it worked fluently.
Is there any reason why it’s not working on Cubase?
What should I do to make it work ?