No IPv6 Service Network Definition returned when adding IPv6 service address to load balancer in VMware Cloud Director

Products

• VMware Cloud Director

Issue/Introduction

When attempting to add an IPv6 service address to a load balancer in VMware Cloud Director 10.6.1.1 the error is returned:
Error: [ ################ ] Cannot use Virtual IP address ################# as Edge Gateway EDGE-############# has no IPv6 Service network definition.

Environment

VMware Cloud Director 10.6.1.1
VMware NSX 4.x

Cause

DHCPv6 with SLAAC is not enabled on the edge gateway for the load balancer.

Resolution

Enable DHCPv6 with SLAAC through Cloud Director as per: https://techdocs.broadcom.com/us/en/vmware-cis/cloud-director/vmware-cloud-director/10-6/vmware-cloud-director-service-provider-portal-guide-10-6/managing-networking-resources-admin/managing-nsx-t-edge-gateways-in-vcd-admin/managing-nsx-advanced-load-balancing-on-an-nsx-t-edge-admin/enable-or-edit-a-load-balancer-admin.html. 
Then re-attempt adding the IPv6 address.