Shading issue on flat surface

There is some shade of black on the surface of the desk I made. I don’t understand why this is happening. I’m not sure if it is a modeling issue, UV, or maybe there’s some settings in unreal engine that can fix this. I hope anyone could help me.

It looks like the model has a bevel on the edge. If that’s the case, you need to fix in the modelling software.

Hi!

I think either your lightmap resolution is too low for the desk or your lightmap uv is not properly laid.