Resolved after 77 days 15 hours, affecting East US2 and France Central and 1 more, on April 1, 2026.
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
Affected components
Update timeline
- identified Apr 01, 2026, 04:50 PM UTC
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
- resolved Jun 18, 2026, 08:25 AM UTC
Issue has been mitigated.
Your product runs on more than Commvault
Add the vendors you depend on and get one message when any of them reports trouble. Free for 3 vendors, no card.
Amazon Web Services