I tried to repeat your working procedure, and unfortunately i can not repeat this issue as you mentioned (the fbx missing the facial animation).
The animation seems to be good in Unity (please see the following link), could you help to check the procedure that is the same as yours?
iClone , 3DX Export FBX
Import FBX to Unity
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Please capture a screen video about this issue, put it on the YouTube, and add the link in your next comment.
3dx 7.1 hasn't fixed this issue. Why is fixing such a crucial bug being done so slowly?!