Harmony hub (bluetooth) and raspberry Pi 3 with Kodi

I’ve gotten the harmony hub to recognize my Pi by setting it up as a device being a raspberry Pi computer.
I am able to program the up, down, left and right keys, but I cannot program anything else. No play, pause, ok, back or anything like that.
I have kodi installed on it and I’m trying to use it as a media centre. So this is being problematic. Anyone know how I could program extra keys?