Question Skinned Mesh Render position not working from Blender Export

Hello,

I have been trying to figure out how to spawn particles in VFX graph on a mesh to make a trippy VR avatar experience. Anyhow, I have the entire flow working when I use the Beta asset (https://github.com/keijiro/jp.keijiro.beta) from Keijiro, and it looks great.
Now, I don't want this asset as I have my own model with wings etc that I want to use.

However, whenever I set this model as the skinned mesh nothing works anymore. The particles are emmited from the center of the object (where the mesh center position is) and not the vertex anymore.

I tried to understand so, I imported Beta in Blender and Exported it again as FBX, and when I do this it doesn't work anymore. So it is not the Mesh itself but ... the FBX (or DAE) export I do from Blender that seems to be the problem...
I need help ! What can I do to make my Blender rigged meshes register with VFX graph ???

PS: Using URP, using Unity 2021 LTS, tried many meshes from Blender.