Hey there @joseemarie!
First off, welcome to the Community
I noticed that you've also posted the same question on our French board. I'll update our reply there as well.
I understand that your printer is currently not discoverable on your Wi-Fi network.
What happens if you plug it directly with an Ethernet cable? Are you able to successfully connect and use it on your network that way?
Let us know!
I finally figured out that the only way I could connect my printer was by using the WPS button on the router. I didn't have a wire to use. Once I figured the WPS method out, it was super quick and easy. Yay!