Identified - Description: 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
Jun 22, 2026 - 12:35 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
Jun 22, 2026 - 12:35 UTC
Office 365
Operational
Frankfurt
Operational
Reports
Operational
Frankfurt
Operational
REST API
Operational
Frankfurt
Operational
Usage & Metering
Operational
Frankfurt
Operational
Web Portal
Operational
Frankfurt
Operational
Operational
Degraded Performance
Partial Outage
Major Outage
Maintenance