The ARK Serverlist in the Main Menu does often not show all servers, not even if u search for them. I had this problem frequently. Just use the direct connect shortcut (described in "Server Settings and Rules" in this forum) and u should avoid this problem.
Another option is to add the server to you favorites and join them via steam direct: in Steam Brower View -> Server -> Favorites . Here you can add the Server and join just via the Connect Button.
Last Edit: Dec 30, 2018 15:03:33 GMT -6 by mrkibbler