The idea of a compatible skeleton is that I can just replace the skeleton for the UE4 or 5 and everything works just fine.
If I need to retarget the animations to the CC4 skeleton in unreal enigne, we are talking about NON COMPATIBLE skeletons.

Are you aware of this issue? This is happening for way to long and I never get a response.
Thanks.

I second this person's post. I am also still waiting for a UE5 compatible character export. 

I thought so too. I purchased an entire package last night thinking hey i can just export and not worry about the retargetting to save time. But nope. Needs fixing!