Commvault incident

Exchange Online Backup Failures (Forbidden Errors)

Notice Resolved View vendor source →

Commvault experienced a notice incident on April 1, 2026 affecting East US2 and France Central and 1 more component, lasting 77d 15h. The incident has been resolved; the full update timeline is below.

Started
Apr 01, 2026, 04:50 PM UTC
Resolved
Jun 18, 2026, 08:25 AM UTC
Duration
77d 15h
Detected by Pingoru
Apr 01, 2026, 04:50 PM UTC

Affected components

East US2France CentralCanada Central

Update timeline

  1. 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

  2. resolved Jun 18, 2026, 08:25 AM UTC

    Issue has been mitigated.