You have to select your user template and then in DEVICE MEMORIES, select which user number (drum pad used for MAP SELECT) then click on STORE TO just below. The user map will then program the keyboard controller with your template. Then, you need to press on MAP SELECT then press on the drum pad that you stored to. Don't forget to press on MAP SELECT again to not select a map or if you tap on a drum pad, you'll change the mapping.
Another point is that the MCC program works for Arturia devices. I'm not sure if your Nektar P1 has programmable functions coming from the MCC software. Since I don't have a NEKTAR, I can't say for sure.
I have read the sales information about the Nektar P1 and it mentions the following DAWs ( Bitwig Studio, Cubase, Nuendo, Logic Pro, Reason, Main Stage, or Reaper) but no mention of Ableton. Ableton requires a MACKIE CONTROL in the DAW mode while others require HUI control. Each one communicates differently so you might want to check into that. Maybe ask the people who make the Nektar device.