Surface to Surface Radiation - material defined emissivity not being applied to boundaries

Hi -

I'm doing an analysis involving Heat Transfer with Surface to Surface Radiation. With the model set up, the software does not appear to recognize emissivities as defined in each particular material. Under the materials node, none of my boundaries appear to have materials assigned to them, but all of my domains do. And when I try to run the analysis, it returns with an error that epsilon_rad is not defined.

So the domains have emissivities defined, but they do not seem to be carry8ng over to the boundaries. Has anyone else experienced this problem or know how to fix it?

Thanks!