When attempting to remove a workload domain from the SDDC manager the workflow fails on the step to decommission the vCenter with error:
Cause: Error when executing 'Removing replication between <vc_fqdn> and <vc_fqdn> with username <user>, exit code 18
VMware SDDC Manager 5.x
VMware SDDC Manager 4.x
Contact VMware by Broadcom support for assistance.