Are you the same person as >>522729
Because I've already answered your question>>522911
Plus your high poly here has a 90 deg bend instead of any sort of chamfer so I'm not sure what you're expecting to happen.
If this is your first time baking normals I would suggest baking 3D geo to a 2D plane (using floaters or high poly mesh) to get a feel for how normal maps work, what they can do & what they can't. Normal maps are best for faking surface detail, they can't make a cube look cylindrical.