BLENDSHAPE NOT WORKING

Hello everybody,
I have a rig model with some animation and a blendshape node with several corrective blendshapes. I can export andimport the blendshape in Unity, and I can perfectly see them listed under the Skin Mesh Renderer, as I can see the animation curve for any blendshapes, but when I play the clip, I can see in the preview Window of the animation that they are totally ignored. I have tried baking simulation, baking the blendshapes node, different kind of FBX version, why the animation is not affected by the blendshapes?

Thank you for help me, I am stuck on this for the last week and that s driving me crazy