“Make snapsocket” node doesn’t create a socket, it just creates a struct used to describe sockets. Normally those structs are used to describe sockets found on meshes. There is nothing in MSSR plugin that creates new sockets, the plugin can just search for existing ones. It means that if you are making meshes at runtime, you need to create sockets yourself by some other mean.
Actually I don’t really use procedural meshes, I don’t know if it’s possible to add sockets to them. Isn’t there some API for that already?