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Weird Light mass importance volume problem, help appreciated.

So im creating an archvis demo room and every time i try to use weird light mass importance volume it doesn’t work properly, the room is completely dark with no assisted light unless im just doing it wrong but here are some pictures, any help is appreciated.

Here is after building when adding the importance volume
16cad209d68714051596a122813b7f4ffe23ebf0.jpeg

No assisted lighting
7521abd40e3cb677c02c06c8b2840e6785d2f085.jpeg

This is during building the light
During lighting.jpg

This is the size of my light mass
Volume box around the house.png

This is weird because every time i move the back wall just a tiny bit, the lighting is suddenly fixed. is there some kind of light blocking going on?
175fb78eb11d52e0d6dadcea7e32483cfe79fe96.jpeg

2d77536ff595da13dccd314b06aef2cbe8dd9f9a.jpeg

any explanation or help is much appreciated.