Why is my Geometry Node Setup not working? I´m currently trying to create a very simple effect using the new Geometry Nodes.

This is my Node setup but it doesn´t work. The Mesh gets displayed by the collection but the effect I want to achieve is not showing. The Vertex group should work as the factor but it doesn´t seem to work. It is mixing between a small and a big version of the Instances.
The effect: I have a proximity Vertex Group (Weight Map) which is getting controlled by an empty. When the empty gets closer to the Surface of the Object, the Weight Map is getting stronger.

And the Goal of the Node Setup is to have a scaling effect happening, using the Proximity vertex Group as the factor.
You are trying to use Vertex group, but in 2.92 vertex groups lose after point distribute.
To get this result you need to use 2.93 Alpha: How to transfer attributes from source mesh to distributed points?
Also in 2.93 you can find the Attribute Proximity node, that's the same thing roughly.