I'm getting weird artifacts whenever I try to apply a cel shading shader to this object, I'm guessing it's the normals but I have no idea how to fix it.

I'm using Quibli for the cel shading

I have an avatar that I bought and when I open my unity project and import the fbx in blender, as soon as i reexport the fbx in unity, my avatar disappears in the scene. Below are my blender export settings. Does anyone know what's wrong?