Investigating - We are aware of an issue affecting Microsoft OneDrive backup operations, resulting in an increased number of failed backup items for some customers. Our engineering team is actively investigating the issue and working to determine the root cause. We will continue to provide updates as we learn more.
Sep 17, 2026 - 15:03 UTC
Sep 17, 2026 - 15:03 UTC
Identified - Description: We are tracking reports of "Forbidden" errors during Office 365 backups caused by a recent Microsoft Exchange Online behavior change. This affects specific tenants and mailboxes using EWS.
Exchange Online jobs may show User Mailboxes reporting a Mailbox Status of:
Throttling from Exchange, Failed to process mailbox due to [The request failed. Forbidden]
Resolution:
Additional information and steps to resolve this can be found here, https://support.commvault.com/Article/Details/KA-191556
Jun 22, 2026 - 12:36 UTC
Exchange Online jobs may show User Mailboxes reporting a Mailbox Status of:
Throttling from Exchange, Failed to process mailbox due to [The request failed. Forbidden]
Resolution:
Additional information and steps to resolve this can be found here, https://support.commvault.com/Article/Details/KA-191556
Jun 22, 2026 - 12:36 UTC
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