I have seen a few posts around with people having issues with this tool. This tool is used if you are installing a multi-site setup for SSO, allows to export the data to then import to a secondary site, or to use as a backup of the configuration.
If you follow the syntax provided this is what you may see: note I was using an admin account i created in case of the admin lockout called backdoor@system-domain.
But works if you remove the spaces between the parameters and the value:
doesnt look right but hey it does the job.