Skin mesh fitting failed

Can someone help me with this problem? I try to do skin mesh fitting. The model has an oral cavity and the mouth should be able to open. However after I do post mesh the mouth does not open when the model speaks, instead its neck moved… There should be no issue with tagging points. I cannot find the reason for this problem.

Hello @chunjie.zhang! Check out the tutorials from this forum post: LIVESTREAM: Getting Started: Audio2Emotion (Wed. August 31 3PM PDT / 6PM EDT) and let me know if they help!

Thanks for your advice. I have figured out the reason. The mouth part of the model I used got some problem and caused this bug.