Retarget metahuman head missing

Hi
i followed several youtube tuto and even the official tutorial on unreal engine retarget animation metahuman.
At the end, the body moves but i get an issue and i need help… head is missing.
I have understood that head is separated from the body and the body animation is good but i don’t know how to fix the problem.
I don’t want it in the sequencer but in the game itself.
please help me …