Ok so from what I can see, the VR pawn does not have any colliding components by default, other than the HMD mesh, which is set to No Collision and is also hidden from the player. So what you can do is you can add a Capsule Collision component at the root of your pawn, and set its collision settings to maybe Overlap All, or custom and only enable the channels that you want, and also make it Generate Overlap Events, and that should solve your issue.
This was my test project:
I don’t have a VR headset so I had to test it like that but I’m guessing it will work the same way