"Inisible" wifi

Hi to everybod,

I have a new Pi 3 and i can’t see my Wifi on setup (I have configured it on all device at home and in a Pi 1 (with an LibreElec distribution))

The wifi is hidden but it should be a problem (right ?), but I have to set it visible but nothing change.

Any idea?

PS the last suspect is that wifi is WEP (thx mr Nintendo), but i don’t think this could be the problem…