MCX8000 Serato not functioning correctly

just unpacked the controller after 2 years of bugger all dj work… what have I missed? I plug my denon mcx800 into my old Mac load up Serato and drag a song over but nothing shows in my left and right deck on the controller??? I have done the update on the controller and still nothing working , what am I missing???

Are you able to share a video of the mac and serato running