Planar Tracker not transforming Masks

I'm trying to track a mask using the Planar Tracker. I've created the Polygon, and piped it into the input of the Planar Trasform, but the resulting output isn't moving the shape. There is just a bounding edge that moves and covers over the shape.

For this particular result I ended up having to merge the shape with a black BG, that would transform properly through the Planar Transform, and then use a Channel Boolean to put the mask in the alpha.

I just watched the new Fusion Fundamentals FXPHD class and he was able to pipe a Polygon straight into the input of a Planar Transform.

There are two inputs: a mask input (blue) and an image input (orange). In this case - how illogical this may seem at first - you need to pipe it into the *image* input, since it will be transforming the mask.
If you put it in the mask input, your polygon will limit where the planar transform is applied (as it should, because that's how masks work in Fusion)
So you're pretty close. Just use the other input and you should be good to go.

No, this behavior is when piping it into the image input.