Floquet and lossy material

I want to assign a face in hfss with floquet port but i get an error that floquet ports may not touch an object whose material is lossy.

how do i assign my port with floquet?
I need the floquet port and i need to keep my lossy material(pec) as well

Can you try to add a vacumn box over the material and assign the floquet port on it, and then deembed?