Does anyone know why you can not chamfer a surface body?
The work around I currently do is make a solid body from my surfaces, chamfer the solid body, then offset all surfaces of the solid body 0 (so copy the outer surfaces) to get my chamfered surface.
Have no idea why it's not an available feature for surfaces. Seems logical.
If you have a fairly simple surface, you could also sketch a line for your chamfer, surface extrude it, and trim away. Still a workaround.