Exchange Online PowerShell update fixes certificate authentication failures
Reviewed by Helen Jones
Microsoft published ExchangeOnlineManagement 3.10.1 on 24 July 2026, with release notes saying it fixes certificate-based authentication flow bugs and minor performance issues. Tony Redmond describes affected automation connecting successfully before later Exchange Online cmdlets failed with authorization or missing-method errors in some multi-domain tenant scenarios.
Unattended Exchange administration often relies on certificate-based authentication so scripts can run without an interactive sign-in. When the initial connection appears healthy but the first real cmdlet fails, monitoring can report a confusing script problem instead of an authentication regression. Version 3.10.1 gives administrators a defined update to test, but a module upgrade can affect every scheduled task or Azure Automation runbook that imports it. The safe response is a controlled upgrade and regression test, not a blind update across production jobs.
Analysis
Inventory scripts using Connect-ExchangeOnline with certificates, test version 3.10.1 against a non-production mailbox query, then roll it into scheduled jobs only after the authentication and output checks pass.
Source note
Pulse published by Collab365 Spaces, reviewed by Helen Jones on . Cite as "Exchange Online PowerShell update fixes certificate authentication failures", Collab365 Spaces. 1 source referenced.