So I used Headshot 2.0 to make a new character and put them in iClone in order to export a sitting pose to UE 5.2.  I just did a full export to Unreal on a new, clean skeleton.

Also just realized some morph targets show on the skeleton for face curves but they don't do anything.

The character comes over fine, but the anims are not right.  
Here's the sitting pose:

Looks like you forget to tick "T0 as reference pose" and "import morph targets" in the UE5 fbx import (advanced) settings.

Thanks!  Been a while since I went from CC to UE.