Just use it with onPlayerJoin event and without 'if isTransferBoxActive() then' condition.
Make sure to include element in setCameraMatrix while server side and remove an 'end'.
That issue is about the client server browser, it has favourites and i suggested the oppsite - black list, where users would be able to block certain servers for themselves. Not a global black list.
But the global list would be better, why would someone play on an fake server which is trying to copy another ?