Issue: Some Parts of Model Show Dark Indirect Light in GI

When I run Generate Lighting in GI, there’s an issue where some parts of the model appear dark for the indirect light, similar to the screenshot. Currently, I’m using two elongated Area Lights, and adjusting their shape, direction, and intensity doesn’t fix the dark areas shown in the screenshot. There doesn’t seem to be any specific issues with the model and shaders. How can I resolve this problem?