Support Statement - Exchange Online Basic Authentication Deprecation
Purpose
This article provides information on actions that must be taken to ensure Veeam Backup for Microsoft 365 will continue to function after the Basic Authentication Deprecation in Exchange Online.
Associated Error Messages
The following errors may be shown in Veeam Backup for Microsoft 365 configurations that were not updated to account for Microsoft's depreciation of Basic Authentication:
- Warning: The request failed with HTTP status 401
Required Actions
Organizations added to Veeam Backup for Microsoft 365 using either Basic Authentication or Modern Authentication with Legacy Protocols, must be switched to Modern App-Only Authentication.
The two configurations shown in the screenshots below will no longer function after Basic Authentication is deprecated.
Basic Authentication
Modern Authentication with Allow Legacy Protocols enabled
Switch to Modern App-Only Authentication
To continue protecting the Organization's Microsoft 365 environment after Basic Authentication is deprecated, the authentication method used by Veeam Backup for Microsoft 365 to connect to the environment must be set to Modern authentication.
Modern Authentication
To change the organization's authentication within Veeam Backup for Microsoft 365:
- Select the Organization and Click Edit
- On the "Microsoft 365 connection settings" page of the wizard, select the option for "Modern authentication"
Do not select the option labeled "Allow for using legacy authentication protocols" - Proceed through the rest of the wizard steps.
Reference: Select Azure Region and Authentication Method
Required Permissions
SharePoint/OneDrive Sites
When using Modern App-Only Authentication, Veeam Backup for Microsoft 365 utilizes custom scripting to process web parts of SharePoint/OneDrive sites. To prevent issues processing WebParts, review and implement the solution documented in KB4091.
Back Up of Public Folder Mailboxes
Support for backing up Public Folder mailboxes when using Modern App-Only Authentication was added in Veeam Backup for Microsoft 365 7 P20230704 (7.0.0.3968).
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