Materials making all surfaces black after light baking

Having materials on surfaces seems to break light baking. Anyone know a solution?

I removed the material after the bake to see if it would change and there the light was

Hello there @SMILEYGAMEPLAYZZ!

This issue has popped up from time to time across the community, mostly tied to 5.5. Please confirm which version of the engine are you currently working with, and if your project was recently migrated, as this issue should no longer be present in 5.6.

Additionally, I would also suggest to make a clean driver install, and using any Developer drivers available, as well as switching between DX11 and DX12 during engine testing.