Sketchup to SketchFab - 400 Error


I have a tiny model, I can upload it manually to sketchfab but using the Sketchup to Sketchfab and I get a 400 Error. Even with a blank model, 4"x4"x4" cube, no textures or materials, I still get this error. Does anyone know what the cause is?

@alexschreyer Do you have any insights on how to resolve the 400 error that this community member is experiencing?