Blender Eye Texture Offset Animations in Unity

I am working on a project where I'm trying to import a character model I found online. For this character, the eyes textures (from happy, to sad, or closed) are changed by changing the offset of the x and y coordinates and then inserting a keyframe. In blender when I animate this character the rendered animation looks great, the eyes change and everything is fine.

However, when I import this .fbx or .blend file into Unity, the actual animation (and texture mapping) of the character is fine, but the eyes never change (or at all for that matter). Any help would be appreciated. I have used both cycles with nodes, and blender render, and also tried using the AnimAll add on in blender with no luck. Any suggestions?