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:
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.
To change the organization's authentication within Veeam Backup for Microsoft 365:
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.
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