How do you make Face Blendshape animation + mixamo body animation work together on same character?

I have an *.anim file of face Blendshape + body animation.

And I have another *.anim file of Mixamo body animation.

I want to have the Mixamo anim apply to the body, and the Blendshape anim apply to only the face.

On the Animator Controller, I created 2 layers and 2 Avatar Masks. One Avatar mask has only the Face- I put the Blendshape anim on it. The other ava mask has only the body - I put the Mixamo anim on it. And set each layer to each avatar mask.

HOWEVER. This doesn't work. The Mixamo animation runs and the face does not animate at all. I am not sure what the proper workflow is. Has anyone done this successfully?