Sometimes it is not the model causing the issue. The import might very well have worked with correct normals. But the material might be setup incorrectly. You want to double click the mesh to open it in the specific asset then select Show -> Normals for static meshes or Character -> Advanced -> Normals for skeletal meshes. That’ll tell you if the import worked correctly.
Then you just need to fix the material. My suggestion is that you try to create materials in UE4 itself and not rely on transfer from Blender fbx.