Turn on the Shelly devices with curl Shelly command

Hello everyone,
I am going crazy creating a script.
I want to turn on a shelly, via curl command.
The shelly is behind a vpn so home assistant does not detect it.
I created the string in yamly, it is the call to the script.

In yamly I have add:


shell command:
Open_box: curl http://192.168.0.64/relay/1?turn=on’

In script I have add: 
- service: shell_command.Open_box’

The script starts but the light stays off.
Where do I go wrong?

Tks a lot