With all those bones, if you are using bones for controllers, you also have to have all the bones parented to the root. The skeleton can have one root only. If a controller is not parented to the hierarchy, it will not import. You also only want to animate in pose mode in blender. I’ve tried plenty of other ways to rig like I do in maya, the only way it worked was using bones for controllers. You can change the shape of the bone in the bone options menu to make it look like a controller.