Azure AD Application Permissions

Veeam Backup for Microsoft Office 365 requires that you grant permissions to Azure AD applications to back up and restore data from/to your Microsoft Office 365 organizations. Azure AD applications must have different permissions in organizations with modern app-only authentication and organizations with modern authentication and legacy protocols. For more information, see the following sections:

• Permissions for Modern App-Only Authentication
• Permissions for Modern Authentication and Legacy Protocols

 For more information about permissions in Azure, see this Microsoft article.