Help for animation Metahuman ( UE4-27 )

Hello, I’m doing an animation of a metahuman with the sequencer, I make him move his arms, hands, facial features etc but what I can’t do is make him turn his head or to rotate it with the ControlRig. Any idea what I can do to make it work? I watch lots of tutorials on the net etc and I can’t do it. Thank you for your help
Here’s a little video of what’s going on.