Nostalrius Begins - Quality wow vanilla realm (1.12)

So recently I was looking at the server list and clicked on Test realm-1sVV2. Now I am unable to log back over to either the PVP or Pve realms. All it does is goes through the load process then says "Disconnected from server". How do I fix this problem???? Been stuck on it for about a week now.

Try to double tap enter when you login , it should open you the menu to pick the server.

If that does not work, delete your WTF folder, it resets your default realm, simulates a fresh log in, and therefore will display the "Suggested Realm" option.