Login Error: Email already exists (Family Plan)

https://kb.mailbox.org/en/private/family-account/merge-accounts/

I followed this KB and successfully added email1 to my family plan after creating an alias (email2), making the email2 alias primary, deleting the original email (email1), releasing it, then immediately adding it to my family plan. I set the password and even successfully reset the password, but when attempting to login with email1, we get an error "Email already exists" after entering the password. We can, however, add it to the accounts page (while logged in with email2) in settings and verify that it is receiving email.