o365-2.0.3/modules/o365_links/o365_links.routing.yml

o365_links.settings:
  path: '/admin/config/system/o365/settings/o365-links'
  defaults:
    _form: 'Drupal\o365_links\Form\SettingsForm'
    _title: 'Application links'
  requirements:
    _permission: 'access o365_links settings page'
  options:
    _admin_route: TRUE