Ur816C routing issue

Hey Guys!
I have an issue with my Urc816C. Everything that is coming out from my Macbook (including cubase, tidal, spotify or any media files) is going ONLY the DAW input channel of the Mix1. Only to mix1. So I can’t hear the click from cubase on MIX2-3-4 . I just don’t find how can I route this. I want to hear the click from cubase on every mix and of course I use some standalone VST plugins which I want to hear also. Where can I route the media players (tidal, spotify) to appear on the “Music” channel on every mix?

Hope some of You can help me!
Thanks a lot!