FaceGen doesn't work with the Millennium figures. Basically, it's a fancy version of the Face Room. It only works on its own head mesh, just as the Face Room only works on the P5 and 6 figures.

When you think about it, it has to work that way. You can't expect a program like Facegen to be able to map and morph any mesh you stick in it. It has to be tied to a specific mesh (or meshes).

The only way to get a Face Room-like program to work on the DAZ figures is for DAZ to make their own plugin (or license it, as CL did with Facegen). They could do it. It would give D|S a big boost if they did.