VMware Cloud director Availability 4.7.x
This issue occurs because the Lookup Service details were not provided during the initial configuration on the manager service.
To resolve this issue populate the Lookup Service details in the manager Web interface.
https://Cloud-Replication-Management-Appliance-IP-Address:8441/ui/admin
You can find more information about Configure the services to accept the vCenter Server Lookup service certificate and optionally allow SSO follow the link Configure the lookup service in the VMware Cloud Director availability site
Note: This can also happen if NTP is not in sync between VMware Cloud Director Availability appliances and vCenter Server.