Outage in Commvault

Exchange Online Backup Failures (Forbidden Errors)

Minor

April 01, 2026 - Started 2 days ago
Official incident page

Incident Report

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

Components affected

Commvault France Central Commvault East US2 Commvault Canada Central

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Latest Updates ( sorted recent to last )

IDENTIFIED 2 days ago - at 04/01/2026 04:50PM

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

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