UEFN skeleton animations do not retarget well to UE5 skeleton

Hello

I’m trying to retarget an animation from the UEFN mannequin to the UE5 skeleton, however the fingers don’t seem to rotate properly and the distance between the hands is incorrect. Here’s a screen shot of how they look in the IK retargeter. Any idea why this is happening? I would have expected animations to work seamlessly across both skeletons. I tried adjusting the base pose of the target but don’t seem to be having much luck.

Thanks
LB