Migrate and resync operations fail when there are stale objects on the source data center (13775)
If the source data center is down, and the Recover operation is performed, there may be some stale entries of workloads and datastores on the source side after the data center is functional. If these entries are in inaccessible state on the vCenter console, then Resync operation is unable to clean the entries. And hence when you migrate back the Migrate operation fails.
Workaround:
Before you migrate back to the source data center, you need to manually cleanup the stale entries.