With G Suite Single Sign-On support, Directory Server can become an identity provider for your G Suite domain. This allows users to log into G Suite services (such as Gmail or Google Calendar) using their accounts and passwords stored on Directory Server, eliminating the need for users to remember another set of accounts and passwords.
If Google 2-step verification is enabled for your G Suite administrator account, please use your application-specific password instead. For more information, see Google's support documentation.