Http failure during parsing for https://cloud.example.com/api/admin/org/########-####-####-########85f9/settings/federationVMware Cloud Director 10.6.x
The load balancer on top of the VCD cells is blocking the XML file.
Review the load balancer configuration to allow the XML files.
Bypass the LB. For additional info visit How to bypass a Load Balancer in Cloud Director using Hosts file