Custom rig not receiving any light on specific MeshPart

[C_Sharper (Sharpie)]

I really have no clue what the problem is regarding this.

Here is a screenshot of the rig with a light shining on it:

And here is how it’s supposed to look:

I have no clue why it does not register lighting on any of the normals of that specific body mesh (there are two) unless the light is in a super specific place, it only seems to light up the chin area.

Thank you for any advice.

[C_Sharper (Sharpie)]

(Solved from an external thread)

The issue was the surface normals were not calculated correctly, so recalculating them in Blender solved the problem.