It looks like your characters are on Kurinnaxx. That is one of the realms that is being consolidated. More information can be found here. This was something that was announced back in June, allowing folks some free character moves off of the realm to prepare. I’m sorry you missed the notification.
When the process is complete, the characters will be on Sulfuras.
The consolidation process is still ongoing. If you did not take advantage of the Free Character Moves that were announced in June, then any characters that remained on a realm that is being consolidated won’t be accessible until that process is complete. This can take up to two weeks, though we hope to have it completed much sooner.