To complete the Essentials Setup Wizard, connect Essentials to your Office 365 account to import domains from your Office 365 account. You will need Office 365 admin credentials to complete this step. When you click Authorize, the Office 365 login screen displays. Log in using your Office 365 admin credentials, and click Accept in the permissions page.
Click Authorize to sign in to your Office 365 account using your admin credentials; review the list of permissions, and click Accept to grant Barracuda permission.
Click Cancel Setup to exit the wizard and return to the Barracuda Essentials page, or click Back to return to the previous page in the wizard.