Cannot get UE 5.4 Motion Matching working with imported Ready Player Me model

I tried importing a Ready Player Me avatar for my character that is animated using UE 5.4’s motion matching Motion Matching In Unreal Engine | Unreal Engine 5.4 Documentation | Epic Developer Community and I can’t get the character to animate. They are just stuck in T pose.

Does anyone know if this type of animation is supported or have links to docs / videos or how it’s done?

Thanks!