I think you should try this video to import. Here are my import settings and i also used the cc_setup plugin. I also retargeted the third person character animations to my new model and they worked fine, except from the hair of course(i don’t know if this helps, i just thought to mention it just in case). From what i can tell though, the bones are exactly like the UE third person mannequin, apart from the cc_base_jawroot bone which was assigned to “Custom_1” and there are quite a few other bones from the skeleton tree like eyes, neck, head etc, that are not assigned to anywhere in the retarget manager, at least from what i can tell. I didn’t do anything to the bones manually, it was all done by the program by default.

I just created a basic model with the program and then followed a tutorial that showed how to export the model from character creator and import it to unreal engine. I didn’t add any custom bones, if that is what you mean. Do not delete any custom bones, Does your original skeleton have any custom bones that may have been over written ?, It is hard to say what the problem is without knowing how it was imported etc etc…

Character creator 3 custom hair