DJM 900 Nexus & CDJ 2000 Nexus’s with Djay Pro 2


I’m trying to set up my CDJ 2000 Nexus’ with DJM 900 Nexus into Djay Pro 2 (on Mac) - all Pioneer Hardware is linked via local network switch and Mac recognises the mixer using Pioneeer driver when plugged in via USB. When I drop in a USB cable from the 900 to the Mac with Djay Pro 2 open it pops up asking me to map the 900 Nexus rather than native click and play support. The image attached suggests it’s possible (although I only have 2 decks linked). What am I doing wrong?