Velocity mapping on piano instruments via Vaults (Logic Pro)

I’m really struggling getting a velocity response from a physical digital piano mapped onto any of the Vaults instruments in Logic Pro. It works flawlessly on piano plugins from other producers so I’m confident in the hardware and Logic settings in general, and there’s clearly something I’m missing with the Crow Hill Vaults instruments. I don’t know if it’s something conceptual and fundamental that I’m not getting, or if there’s a technical problem, but I’ve run out of ideas and/or understanding. If anyone’s got any pointers or can explain what I’m missing, I’d be really happy because they are lovely, lovely sounds (even with no volume or timbre variation!). Thanks in advance!