In Mac OS X 10.12.6, using a script with scutil to start VPN gives me an error
I found the answer by myself.

I had a similar issue on macOS 10.12.6
Root cause was, that I also changed the configuration name of the VPN.  

After removing the old VPN and creating a VPN with another name and configuration "Default",
 it works with both the command scutil and networksetup



With this I can start the VPN from shell with both scutil and networksetup