We try to provide what warnings and notices we can in these events, but a temporary message system simply doesn’t exist in-game for character services.
Keep in mind, this is impacting a fairly small portion of folks attempting to use the transfers, so turning them off for the 99% that aren’t having any trouble isn’t always practical.
While we cannot have in-game notifications, for temporary issues like this we usually provide Support Articles and forum posts, like the one we have stickied at the top of this page.
The Transfer Tokens themselves are not lost, they just cannot be used under certain conditions, the most common is for those trying to transfer to an RP realm, as in your case. The team working on the issue believes they are making progress please keep an eye on the Transfer Token Known Issues thread for updates.