The vCenter Server virtual machine is not connected to a distributed virtual port group or the dvpg has an association with non management traffic type for <vCenter FQDN> ErrorPlease ensure the vCenter Server virtual machine is connected to a distributed virtual port group (dvpg) and the dvpg is not associated with non-management traffic type
vCenter 9.x
The vCenter VM is not managed by the same instance.
To resolve this issue move the vCenter VM to a supported location by using VMware vMotion. See Migrating Virtual Machines Between vCenter Systems
For more information refer Import an Existing vCenter to Create a Workload Domain