Parenting to vertex modified by Shape Keys

I have a mesh that I have animated with keyframes for both location and shape keys.

Now I have another mesh, and I would like to have it linked to the shape-key the deformation. I have tried to do that by parenting the second mesh to a vertex in the first mesh.

But while the animation shows the second mesh following the first generally, it is apparently not being affected by the Shape Key animation.

Any suggestions?

I just tried what you said, and it worked fine for me. Try using two boxes as i did and see what happens.

Works perfectly for me as well.

You need to show us what you have and supply a demo blend file since it appears that what you really want to do must be different to what we think you want to do