Hi Emilie
The guide you followed is no longer valid (indeed, the whole drupal-tools website is scheduled for a major overhaul in light of the migration to OpenShift and subsequent upgrade to Drupal 9: We simply have not yet had the time to do so, however). Please see https://drupal-community.web.cern.ch/t/setup-authorization-access-to-drupal-site/1137 instead. We apologise for the inconvenience.
Thanks!