Mass created by Direct.Shape not allowing Wall by Face

I created a Mass in Revit using a simple grasshopper script. The mass is brought into Revit just fine but the wall by face command is not allowing me to select any surfaces - is the script I used not correct? is the geometry too complex? - I’m new to rhino.inside so apologies if this is an obvious fix, I appreciate the help

I uploaded the rhino model if anyone wanted to take a look - thanks
Nurb test.3dm (382.6 KB)

Hi Bill,

DirectShapes aren’t ‘Real’ Revit families and are not eligible for Hosting.

There is a Direct Shape Type that you can use to place instances by Location.

Here is some additional information about DirectShape capabilities