My server isn't letting me join. I have 3 different Aternos servers and 1 of them let's me join perfectly and that server was 1.15.2 spigot. The other 2 were 1.8.0 spigot and doesn't let me join, it keeps saying "Disconnected.". This happened yesterday too with 1.10.2, 1.11, 1.11.2, 1.7.4. I tried changing the first server to 1.8.0 spigot to see if it worked and it did the same as the other two. PLEASE HELP.