Adding Microsoft 365 Organizations with Modern App-Only Authentication

When you add an organization using the modern app-only authentication method, you are required to provide Azure AD application settings. Veeam Backup for Microsoft 365 uses such an application to establish a connection to your Microsoft 365 organizations with enabled security defaults and maintain data transfer during backup and restore sessions.

With modern app-only authentication, you cannot use Veeam Backup account; only communications through Azure AD application is possible.


Adding Microsoft 365 organizations using modern app-only authentication is not supported for legacy Microsoft Azure Germany region. For limitations in Veeam Backup for Microsoft 365 functionality when protecting organizations with modern app-only authentication, see this Veeam KB article.

To add a new Microsoft 365 organization to Veeam Backup for Microsoft 365, do the following:

  1. Launch the Add Organization wizard.
  2. Select an organization deployment type.
  3. Select Azure region and authentication method.
  4. Configure connection to Microsoft 365.
  5. Register or select Azure AD Application.
  6. Log in to Microsoft 365.
  7. Finish the wizard.