Mesh Collider is empty; fbx exported from blender

Hi, I've exported my mesh collider from blender but I've tried but failed to generate the mesh collider but it's not working.

I've tried: Toggling on the Generate Collisions on my mesh settings Adding rigidbody, turning on convex still does nothing

Is there an issue or setting that I need to tweak when exporting from blender for it to properly generate collisions for Unity. Does normals, or collisions in blender need to be tweaked in some way?

Thank you in advance!