MO797366: Microsoft 365 suite Service Health Incident

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365 Service Alert

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May 31, 2024, 1:29:35 PM5/31/24
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Users with Conditional Access Policies may be unable to access Microsoft 365 services and features.                                                                                                                                                                                                         
Microsoft

Users with Conditional Access Policies may be unable to access Microsoft 365 services and features

ID: MO797366

Issue type: Incident

Status

Service Degradation

Impacted services

Microsoft 365 suite

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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