Outage in Microsoft 365
Some users may be unable to access email messages in Outlook Mobile when connecting to Exchange on‑premises
Resolved Minor
April 10, 2026 - Started 4 days ago
- Lasted 3 days
Incident Report
Summary AI Generated
An authentication component misconfiguration disrupted the Autodiscover flow for Exchange on-premises connections, preventing some users from accessing email messages through Outlook Mobile for 71.9 hours starting April 10, 2026. Microsoft identified the root cause and was developing a fix to correct the misconfiguration that was blocking Outlook Mobile from automatically establishing access for affected users. The incident had minor status and impacted users attempting to connect to Exchange on-premises environments through the mobile application.
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
Components affected
Exchange OnlineTrusted by 1000+ teams
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Latest Updates ( sorted recent to last )
about 17 hours ago - at 04/13/2026 01:45PM
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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