Wrong Vertex Normal in FBX animation

Hi everyone!
I´m having an issue with vertex normals in an animated model I exported in FBX format from Maya.
I have this in Maya

I get this in Sketchfab

It only happens when I upload the model to sketchfab.

Has anybody had the same problem?


Like these problem ( Black spots on the mesh ) it seems to be a problem with Normals.

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