Some users may be unable to access email messages in Outlook Mobile when connecting to Exchange on‑premises
ID: EX1278714
Issue type: Incident
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Status
Service Degradation
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Impacted services
Exchange Online
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Details
Title: Some users may be unable to access email messages in Outlook Mobile when connecting to Exchange on‑premises
User impact: Users may be unable to access email messages in Outlook Mobile when connecting to Exchange on‑premises.
Current status: We've identified that an authentication component misconfiguration is impacting the Autodiscover flow for Exchange on‑premises connections, which is preventing Outlook Mobile from automatically establishing access for affected users. We're developing a fix to correct misconfiguration and once complete, we'll validate its efficacy before deploying to affected environments.
Scope of impact: Your organization is affected by this event, and some users attempting to access email messages in Outlook Mobile when connecting to Exchange on‑premises may be impacted. This information may be updated as our investigation continues.
Start time: Friday, April 10, 2026, at 5:30 PM UTC
Root cause: An authentication component misconfiguration is impacting the Autodiscover flow for Exchange on‑premises connections, which is preventing Outlook Mobile from automatically establishing access for affected users.
Next update by: Monday, April 13, 2026, at 6:00 PM UTC
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