Can you check if:
- The checkbox next to the “Simulation Generates Hit Events” is ticked, which should be accessible in the details window while your collision box is selected
- The collision bounds are big enough to allow the player character’s collision capsule to get in contact with it
- The collision presets of the collision box is set to “Overlap All” (yeah i did ask you to set it to block all previously, as I was still focused on the physics approach)