HELP ME!! Why my Ponytail bone of bip in 3ds max cant action in unity??

Unity Engine
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HELP ME!! Why my Ponytail bone of bip in 3ds max cant action in unity??

There is a character having two Ponytail bones behind the Head bone.
I have done action on it key by key.
And I export them as FBX file into Unity. Besides the Two Ponytail bones …All of the Bones act!!
Why Ponytail bones cant action??
there is the wrong ??

2

I find if I use Legacy mode to animate in Unity.The Ponytail bone can action.
I find if I use Humanoid mode to animate in Unity.The Ponytail bone cant action.
But in the configure there is no bone can relay Ponytail bone in HEAD!!
how can I do??

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avatar mask

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How to do ??

I have saw it .but I still have no idea to do it…