Hi!
Which playback template are you using?
When looking at the percussion maps, make sure that you have the correct one activated, this is the Yamaha XG which comes with the HALion Sonic SE -playback template:
At least there the kick drum is in the correct place (C2)
Then you simply select the pad you want to assign to kick drum, put it to the same midi note (C1 - in Arturia’s MIDI control center everything is one octave lover for me…)
After that you need to click “Store to” and the kick drum should be working.