We backup an O365 organization with Veeam Backup for Microsoft 365 7.1.0.1501. Everything went well, but tonight the backup of all mailboxes failed with error message: "Processing mailbox failed with error: Failed to get folder properties. Not allowed to access Non IPM folder." Also the backup of all teams failed with error message: "Failed to process team. Failed to get folder properties. Not allowed to access Non IPM folder." The backup of OneDrive and SharePoint worked properly. Any idea?
Best answer by Nakatomi
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