Identified - 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
Apr 01, 2026 - 17:07 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
Apr 01, 2026 - 17:07 UTC
Reports
Operational
Canada Central
Operational
REST API
Operational
Canada Central
Operational
Office 365
Operational
Canada Central
Operational
Web Portal
Operational
Canada Central
Operational
Usage & Metering
Operational
Canada Central
Operational
File & Object
Operational
Canada Central
Operational
SalesForce
Operational
Canada Central
Operational
Database
Operational
Canada Central
Operational
Dynamics 365
Operational
Canada Central
Operational
VM & Kubernetes
Operational
Canada Central
Operational
Active Directory
Operational
Canada Central
Operational
Endpoint
Operational
Canada Central
Operational
Operational
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Maintenance
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Posted on May 10, 2026 - 08:02 UTC
Posted on May 10, 2026 - 08:02 UTC