Mailbox issue restricting server transfer

I’ve seen multiple people have this same problem yet were all in the same position. I have cleared all my mail, have zero auctions, zero quests in my quest log, and have zero players on my block list. Yet when I go to transfer any other of my toons I have no problem server transferring them. Are there any other solutions I can exhaust?

This thread is now closed, but they were manually clearing mailboxes for people that posted in it. Not sure if there is a new one, but if there isn’t you can probably make a thread and ask for the same thing.
https://us.forums.blizzard.com/en/wow/t/mailbox-purge-active-thread/1350943/2382

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