If clicking on the "Join Server" button doesn't work, or it's grayed out, that means that the owner of the server has not properly set up the Discord Me bot. If there is a disconnection, the server owner will receive an email asking them to reconnect. After a few days of being disconnected, that server may be removed from our public listings. Unfortunately, it is up to server owners to reconnect the bot with the server, so it may remain unconnected if they do not address the issue.