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I tried everything and can't get it to work at all. My unit scale is correct.I used the Diffuse Material Shader and added a Scattering map to the Medium. Dropped the density and increased it. No SSS. I have the scene lite up with only 1 hdri and 1 octane light. What am I doing wrong? Is there something in the kernel I have to turn on?

Hi,
Scattering and Absorption can receive only colors, not textures, till v2019.1.
You also need to add a transmission texture, and switch to PT, or PMC.
Better to use Specular material for more realistic SSS effect.
ciao Beppe