Maxivz Quick FFD lattice tool not deforming selected vertices

Hi everyone,

I am having trouble using the Maxivz Interactive Tools addon in Blender. I select specific vertices in Edit Mode and click the “Quick FFD” tool. However, the lattice doesn’t seem to deform or move the vertices at all when I try to tweak it.

I have attached screenshots of my model and where I am clicking the tool. Could anyone please guide me on how to properly make it work or what I am doing wrong?

Thank you!