Cloth not working in playmode


I’m stuck with a simple cloth that must behave like a curtain, i imported my fbx with my plane skinned to one bone and applied successfully the cloth as described here :

and this is what i get :

BUT when i put it in the scene and press play nothing happen, I tried to add wind and many tricks but I can t figure out why it doesn t simulate.
If anyone could help with that shard, would be great.

EDIT : i got it working using it in another project, so it must be projet settings related but i’ m still searching…