Midi Mapping not showing all devices

Hello, I bought a DDJ-400 and it works perfectly fine with rekordbox, but I want to midi map my Akai MPK mini play to expand functionality, but when I enter the midi mapper I can only see my DDJ-400 in the dropdown menu, am I facing an issue or do I have to buy a full license, because I know that the DDJ-400 unlocks rekordbox but found nothing about where it unlocks the full version or not, Thanks.