Scene not accepting lighting

I’m hoping this is something ridiculous and simple but I can’t work out why my scene isn’t accepting lighting. I’m only using a skylight (settings attached) and I want the light to shine through the windows but no matter how bright it is, the scene stays black. I added another screenshot after I deleted one of the walls thinking that the light might flood in but same result. I have a lightmass importance volume with ao unchecked and a post process volume with default settings except min and max brightness both set to 1, and the exposure is at 6 on these images.

Any ideas on what’s going on here would be greatly appreciated.

Thanks in advance!