Mocap animation is tilted only upon import into Unity?

Question

I'm working with mocap animations (FBX) that I want to retarget on a Mixamo model in Unity. To start, I opened the animation in Blender and it looks fine (not tilted) -

But when I import in Unity and apply type humanoid to the rig, it comes in tilted / wonky -

Video of tilted animation

I get these error messages in Unity:

Even after applying "Translation DoF" and changing animation type. Why is my animation coming in tilted and how can I fix this?