Does the pawn have a capsule collision?
Because if you’re using a CharacterBP rather then a PawnBP, the Capsule collision is already there, so you’ll inherit all the setup, so it will work out of the box.
Also, are you 100% sure that the elevator/boat have a collision set?
If I remember correctly, for an eleveator using a PawnBP, I simply attached the Pawn to the elevator ( using Z axis only ) as soon as the evelator starts moving, and of course it detachesd the Pawn then the elevator stops.
I used that for VR, so I’m not sure it works with a standard thiumbstick-controlled player.