With standard authentication, you manually create administrative accounts in the Samsara dashboard by assigning a role and email address.
Samsara also supports the use of Google accounts with the Samsara dashboard. To use a Google account to log in to the dashboard you must first Invite a New Administrator in the dashboard. Samsara sends an invitation to the Email with a link to log in. The user must click the link in the Email and choose Sign Up with Google Account. If you previously created the account but the user did not complete the sign-up process, you will need to remove the account and create it again.