If you can’t see the BRIDGE while it is connected to your router with an Ethernet cable, that suggests there is something blocking the ability of the controller in seeing the BRIDGE. What router are you using? Is by any chance your controller on a ‘guest’ network instead of the ‘normal’ network?

You may be better off if you were to call Sonos Support directly to discuss it, but I honestly don’t know if they still support the French language in their call center.

When you speak directly to the phone folks, they have tools at their disposal that will allow them to give you advice specific to your Sonos system and network.