Hi RM - I was just resonding via email. The texture is an exr - if you make it a png then it will work. You also need to make sure that the object has a mesh which can be displaced with some detail - the plane has just one or two polys and displaces as a plane. The exr seems only to want to displace as a plane, it ignores the render mesh - not sure what is expected there but a png works. You may also want to clamp the output as the texture is all on the very light side, or make it a higher contrast like the attached.
-Pascal