When attempting to import a VM in Cloud Director after a failure importing we receive the error message:
"Cannot import VM ####### (vm-####) in RP (resgroup-####) into VDC (##) since it is already managed by VMware Cloud Director."
VMware Cloud Director 10.x
The VM was partially imported before the task failed. There are stale references in the database.
There are possible other causes such as the VM already having a cloud UUID as an extra property in vCenter as well.
Open a support request with Broadcom VCF support referencing this support request number.