azure-backup-vault

I have an old Azure Recovery Services vault for an on-premise Windows Desktop that I am trying to remove after decommissioning said desktop. Azure is responding with this error message: Vault cannot be deleted as there are existing resources within the vault. Please ensure there are no backup items, protected servers or backup management servers associated with this vault. Unregister the following containers associated with this vault before proceeding for deletion : VAULT-NAME. Unregister all containers from the vault and then retry to delete vault Where VAULT-NAME is the name of my vault. I