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 - 17:10 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 - 17:10 UTC
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