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Why am i not getting the right shadows through these windows?

Hey there I have this setup and can’t work out why I’m not getting the correct shadows through these windows (ie there should be large blocks of light showing on the floor), I’ve got most objects at 256 Light Map Res and have static spot lights coming through the window (not casting shadows as there would be shadows all over the place) with a direction light with cast shadows on and I’m using Light Portals and a Lightmass Importance Volume.

This screenshot was a production build.

Any help would be appreciated.