Question White Character Issue

Hi everyone. I have created a model in blender. I imported it in maximo to create animation. When I download the model with animation and transfer it to the Unity, it seems whiter than the original model. Therefore, I tried transfer the model directly blender to unity without animation, the same issue occurs. Finally I tried using AccuRig to create automatic rig to my model, then add the animation. However, I couldn't do it either. Everything seems OK but when I start the game character take a pose like the pose in muscle settings. Animation is an idle animation but it doesn't work in my model. I tried using a model from maximo and it worked because the animation is imported with the model. My white-looking model plays animation because it is imported with the animation too. What is the problem here?