How do I go higher than the Material Tessellation cap?

So I am making a material that tessellates. It subdivides the geo up to “2” on the tessellation amount but then it wont subdivide anymore.
How do I tell it to subdivide higher than what appears to be Material Tessellation cap?
Thank you so much for any help

Its in the tesselation shader files.( like FlatTesselation.ush) [maxtessfactor(15)]

Thank you so so very much!