Clip Children won't work

Honestly just tell me if using some more advanced masking technique might be better...
The player is a global object at the start of the scene I reparent it so I can use a clipping mask however it doesn't work. (the mask wont clip)
I've also tried just loading the player in by itself but that still won't work.

Polygon use as clipping mask

When entering the scene the player is reparented to the clipping mask

Here is the reparenting code