In order to make a surface climbable, it needs to have the tag SurfaceToClimb added to them. That way you only climb what you need and not everything in the player's path.
If you have no other tags than SurfaceToClimb is/should be Tag 8
You may need to add the Tag to your Tags and Layers if it doesn't already exist.
Interact to Climb
If you only want to climb when the player presses a specific button, make sure it's added as a Button Event in Activate Device in the Use Devices Category.
