Outage in Commvault
Exchange Online Backup Failures (Forbidden Errors)
Resolved MinorIncident Report
Summary AI Generated
Exchange Online backups in Commvault failed with "Forbidden" errors across East US2, France Central, and Canada Central regions due to a behavior change in Microsoft Exchange Online affecting EWS-based connections. Impacted mailboxes reported throttling and failed processing statuses during Office 365 backup jobs. The issue persisted for approximately 77 days before being mitigated on June 18, 2026, with resolution steps available via Commvault support article KA-191556.
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
Trusted by 1,000+ teams
The Status Page Aggregator with Early Outage Detection
Stop finding out about outages from your users. Monitor 6,320+ cloud services and get alerted the second something breaks.
Latest Updates ( sorted recent to last )
RESOLVED
about 2 months ago - at 06/18/2026 08:25AM
Issue has been mitigated.
IDENTIFIED
4 months 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
Latest Commvault outages
Degraded backup performance - 25 days ago
Exchange Online Backup Failures (Forbidden Errors) - about 1 month ago
Command Center Logins - about 2 months ago
AWS VM backup Job Failures - about 2 months ago
Degraded backup performance - 4 months ago
The Status Page Aggregator with Early Outage Detection
With IsDown, you can monitor all your critical services' official status pages from one centralized dashboard and receive instant alerts the moment an outage is detected. Say goodbye to constantly checking multiple sites for updates and stay ahead of outages with IsDown.
Start free trialNo credit card required · Cancel anytime · 6320 services available
Integrations with
