I have a model animated made in Maya. This animation have influences at shapes of face (with max 8) but they aren’t animate correctly, some shapes of face don’t animate. Only eyes works OK, however they are joints…
In Maya, make sure you have turned of Segment Scale Transform on all bones (if it’s a skinned mesh).
If you’re animating with blend shapes/morph targets make sure to use the latest (dev branch) FBX loader since there was recently an update to make sure all morph targets are loaded.
If neither of those work, try converting the model to glTF format with FBX2GLTF.