Motion Eye action button with direct link

Hello
I use motioneye ant want to config some action buttons for my pan tilt cam …
When i surf the to following url the cam move and everything is ok:
http://193.168.0.3/cgi/ptdc.cgi?command=set_relative_pos&posX=0&posY=+10

If i use it as action button with the sample command from documentation nothing happens:
command: “curl -s 193.168.0.3/cgi/ptdc.cgi?command=set_relative_pos&posX=0&posY=+10 > /dev/null”

Anyone has a idea how the correct command should be ?
THANKS !