Users with Conditional Access Policies may be unable to access Microsoft 365 services and features
ID: MO797366
Issue type: Incident
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Status
Service Degradation
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Impacted services
Microsoft 365 suite
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Details
Title: Users with Conditional Access Policies may be unable to access Microsoft 365 services and features
User impact: Users with Conditional Access Policies may have been unable to access Microsoft 365 services and features.
More info: Impact included, but wasn't limited to, the following services:
- Exchange Online
- Outlook
- Microsoft Teams
Depending how admins configure the Conditional Access Policies, the impact could have manifested in multiple ways. For example, this issue could have caused a user block or trigger a Multi-Factor Authentication (MFA) prompt.
Final status: We've confirmed that the revert has completed and validated this has remediated impact with affected users and service telemetry.
Scope of impact: This issue could have impacted any user or admin that leverages Conditional Access Policies for Microsoft 365 service access controls.
Start time: Friday, May 31, 2024, at 2:58 AM UTC
End time: Friday, May 31, 2024, at 4:26 PM UTC
Root cause: A recent service change contained a code error that affected Conditional Access Policies, resulting in impact.
Next steps:
- We're continuing our review of the impacting update to better identify and prevent similar issues in the future.
This is the final update for the event.
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