Export animated unity humanoid to animated FBX

I need someone to show me how to export a 3D model from unity into FBX. I want to convert the FBX to USDZ later that's why it must export with the animation. I exported it myself but the walking animation is messed up. It comes out as attached. It's supposed to have a walking animation. But it just rolls back and forth. I need someone to show me how to do it. Need to do this tonight so I need someone available now to show me. I can send sample project.