Backup and restore the Azure Database for MySQL flexible server

The error conflicts with the current geo-restore interface: documented az mysql flexible-server geo-restore has no administrator-password argument, and the portal creates a new server from the source backup. Do not add an undocumented switch or put a secret on the command line. Update Azure CLI, then rerun the documented command with target name, resource group, location, and the source server’s full resource ID. Confirm geo-redundant backup was enabled and the destination is a supported paired region. Run once with --debug and record the operation or correlation ID, redacting tokens before sharing logs. Since the same validation fails from CLI and portal, this likely indicates a service-side validation or resource-state problem, not missing input. Open an Azure support request with those IDs and regions. After restore, review networking, alerts, logins, and application connection settings separately.