How do I convert a blend shape/morphed 3D lip-synced model into a usdz that will play in AR on an iPhone?

Using Maya’s latest version we are attempting to convert a few fbx animations, with sound into a .reality file, without success. In the converter we get a shutdown in conversion after about 2 seconds on two of the three animations and in the latest attempt on the 3rd animation is that the animated characters are stacking on top of each other in the viewer (see image) and we get root node errors. Can you assist us on solving the issue and helping us better understand how to build iOS animations from Maya?