I up my topic, I’ve tried several things since last time and everytime the same problem. I guess this is due to a misunderstanding of the directions between MAYA and Unreal. I post here the settings I used for the export in MAYA and inport in Unreal.
I suspected the “Convert Scene” option in Unreal to be the problem, but if i don’t check it the mesh is on the side in Unreal, despite the -90° trick on the body mesh.