I think the latest release for the LiveLinkFace app might be broken, I have a Blender plugin that lets me stream the animation data and since either 1.3.0 or 1.3.1, the data contained in the network stream seems corrupted (I looked at the UDP dump).
I’m about to check whether it still works in Live Link mode in Unreal Engine itself, but I think this might be worth flagging on the Issues tracker.