While deleting an empty virtual data center (VDC) from VMware Cloud Director UI you come across the error:[########-####-####-####-############] You must delete this Organization's Firewall Groups before you can delete the organization.
VMware Cloud Director 10.5.1
To resolve this issue, contact Broadcom Support and note this Article ID (383382) in the problem description. For more information, see Creating and managing Broadcom support cases