I haven’t tried Rev0verDrive’s way yet, so if it works it works, does it always work 100%?
Here’s what I came up with
Solution #1: You can go into the character and select that capsule and enable physics but then your character will fall over onto his face when you try to walk! 
try it out. If there’s a way to actually set physics it might fix the problem.
Solution #2: Make a collision box attached to the wall which is slightly bigger than the wall, use a overlap event to cause an AddForce node to push you. I got it working that way but it’s just a tiny bit jittery. Setting movement mode to flying stops the jittering so I think it’s caused by ground friction.
All of this seems pretty hacky, and is probably not “the right way”