This read-only object identifies the specific configuration-transfer stage in which an error was detected, using the same stage values as configManagementState, or configAborted if the user interrupted the operation. An admin who sees configManagementState report configInterrupted can check this object to learn exactly which phase, such as verifying, saving, downloading, uploading, using, or making a backup copy, failed, narrowing down troubleshooting. For example, a value of configDownloading here would tell the admin the FTP transfer of the config file itself failed, pointing them to check server reachability or file permissions rather than the equipment's config parser.