Command line command not working (VPN)

Im running a AC5300 with standard, updataed firmware. I want to create a script in the end that can (via a button)switch on and off the routers VPN Client. Before that I want to check that this works via the command line so I log in via SSH (Windows 10 standard SSH functionality) to my router as main user. All that works fine.

I dont change to any particlar directory, just standing in the directory you come when logging in. At this time i write "service start_vpnclient1". Half a second...

Command line command not working (VPN)