Jaw Bone in Avatar is not Free

If the Lip Sync does not seem to cause any facial animations, even after removing all blendshapes from animations, then the following steps should help resolve the issue.

This is a known issue in Reallusion CC4 characters.

Select the Character and head to the Animator component.

Click the Avatar Field once to select the character's avatar in the Project window.

Select the Avatar and click Configure Avatar.

Select the Head option in the Mapping tab.

Select the Jaw Mapping and set it to None.

Finally scroll down and click Apply.

This will free the avatar's jaw mapping and allow the script to manipulate the Jaw bones.