Here: https://pokemonrevolution.net/forum/viewtopic.php?f=16&t=31177
If you are able to see a “logging in” prompt and it fades, please be patient as at this point, the client is attempting to establish a connection and/or will place your account in a temporary ‘ghost’ queue. Afterwards, you will be placed into the server at a later time without being able to see the queue box. It happens when having many people join in server, so try to restart your client and try again. It can take 3-5 times for the queue to be shown.
Thank you!