Compagnion app outside my network

Configuration
1

Hi,

I encounter something odd.
I have that kind of camera in lovelace:

views:
  - title: Maison_bas
    panel: true
    icon: mdi:home-circle
    cards:
     - type: picture-elements
       image: "local/maison_triadou5.png"
       elements:
         - type: icon
           entity: camera.devant
           icon: mdi:cctv
           camera_view: live
           show_name: false
           style:
            color: blue
            top: 32%
            left: 92%
            transform: 'scale(1.1,1.1)

Using companion app or web browser on my phone:
1/ when i am in my home on my wifi network if i click on the icon i can see the view a my cam.
2/ if i am outside my home, if i click on the icon i can’t see my cam from companion app.

can you help me ?
thx