Just an update: me and my friend just cancelled our subscriptions over this.
First GM I spoke with over the issue:
Denvorer: During my investigation, the only realms that currently have any restrictions from being transferred to are Incendius, Faerlina, and Whitemane. The realm Earthfury doesn’t show any kind of restrictions or blocks so you should be able to move to that realm from Grobbulus.
If you are receiving any kind of error message when trying to transfer there, please let us know so we can investigate this more for you."
First transfer was successful. I had then tried to transfer a second character and the transfer failed. Made a ticket and I was told this by a GM:
Scagarrde: “In order to balance realm populations and help mitigate long log-in queues, the Classic World of Warcraft development team sometimes turns off transfers and character creation to particular realms. This is done to prevent more players from contributing to realm overpopulation.”
It’s contradictory and helps no one. It’s just ruining people’s accounts and forfeiting the players that are in this situation. This doesn’t even prevent overpopulation, because we already have characters on that server.