Mapping Traktor Kontrol X1 MK2 with Rekordbox 6.5.1

Hi all,

I am currently trying to map my Traktor Kontrol X1 MK2 to work with Rekordbox 6.5.1. 

Unfortunately the midi button in the top right hand corner of Rekordbox is greyed out, so I've failed at the first hurdle. Has anyone got any suggestions? 

My Pioneer Interface 2 is connected and the software is in performance mode so there should be no issues. 

Thanks in advance!