I've spent the last three days on this. Everything is setup as per installation instructions. I've tried numerous MH characters and new projects but still cannot get a MH face to animate via Live Link. If I transfer a CC character both body and face animations transfer but trying to link to a MH I only get the body to animate. I've attached screen shots of everything I think is relevant, if I've missed something can somebody please put me out of my misery!!
I can animate the face with iPhone Live Link in UE after recording iClone LL but this is not good for moving characters, or at least not so far......

I know this doesn't help, but I'm having the exact same problem. Only the body motion works, can find a way to make the facial animation work through live link from iClone8 to UE 5.4... I hope someone can help us!

Here's an answer from RL that may help you ...
You probably copied the Metahuman Kit folder before downloading the Metahuman. So the data of downloaded Metahuman replaced the data from Metahuman kit.
The correct order is copying the Live Link folder and Auto Setup folder to your UE folder > Download your Metahuman > Copy the Metahuman kit to UE folder.
This information is also pinned on the top comment in the tutorial. https://www.youtube.com/watch?v=N7i40HzZlsc

I go tmy mine working through this process [ish] now however there's no eye movement transmitted.....

I received the same answer from the tech team, but this doesn't do anything for me. Still no facial animation. I'm running the latest iClone8.5 to UE5.4.4. I hope someone point me in the right direction.