I have one user failing to sync between AAD and AD. The error is "sync-generic-failure". The stack trace error is a bit more detailed: "The dimage has an anchor that is different than the image".
The user in question existed in AAD as a manually created user before AD Sync was set up.
The user account was then deleted from AAD, and I think that started this behavior.
Can I remove the link between the AD user and the AAD user completely, so the AAD user can be deleted, and the AD user can be synchronized to AAD?