Apple activation server unreachable

Hello,
Did you buy it new?
This kind of thing happens with iPads that are locked because they are reported stolen and sold second-hand on the street (scam), https://support.apple.com/fr-fr/HT201472.
Otherwise, read and do what is indicated on this page and if it's not better, contact Apple or the carrier or the store where you bought this iPad.
bazfile
Moderator/Contributor security.