No shadows on imported render file

Hi All,

I created a scene in Blender. UV mapped and textured in Blender. Did a light test and everything looks fine. But when I import into Unity, the walls doesn't cast shadows. Lighting is set to real-time.



What I have done so far

The material has an alpha and is set to 'cutout'. However I turned this off and even tried a different material but still nothing

The cast and receive shadows are both on in Unity and Blender

I turned off nodes in Blender

Exported as FBX and .blend, same issue.

Changed lighting from direction to spot light

Set the walls to static

...

Now the one thing I have noticed. If i flip the normals in Blender the shadows work but the walls and ceiling vanish. How do I get both to work?

Thanks in advance for your help