Question Trouble with animation on humanoid avatar (FBX / Blender)

Hello, my skill on rigging / animation / modeling and Blender aren't very high, but right now i'm struggling on creating an animation pose (I'm trying to recreate a Jojo pose) which require some high mesh rotation.
I successfully key posing it on Blender and export it to Unity (as a FBX)
On Blender my model have a Rigify and importing it on Unity gave no errors during avatar configuration.

My issue is that when I'm using a Humanoid Avatar, lower part and arms of body is not well position I first though it was due to IK, so I tried to create a fresh new simple animator + gameobject without IK or other stuff which could interfere, but I was still having the issue.

If I put my model as Legacy pose is working as intented but my aim is to use this animation on more than one model thus why I try to make it work on a humanoid avatar


Thank you