OPERATIONAL DEFECT DATABASE
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BugZero found this defect 619 days ago.
Due to a recent change deprecating an earlier API (EWS), backups of Microsoft Teams may complete with a "Success" status, while no new channel posts were backed up.
As it was announced before, Microsoft is deprecating the ability for EWS APIs to access the TeamsMessagesData folder. In order to resume backup functionality, you must accept Microsoft's Terms of Service for the newer Graph Export API for Teams. Please review KB4322 and take the prescribed actions to ensure all Teams data including channel posts is protected.
Microsoft Devblog: Restricted access to Microsoft Teams data via EWS starts January 31, 2023 Veeam KB4322: How to request access to Microsoft Graph Teams Export APIs Veeam KB4340: How To Configure Veeam Backup for Microsoft 365 to Use Microsoft Graph Export API for Teams
