Title: Users may be unable to load the email remediation side panel in Microsoft Defender for Office 365 Threat Explorer
User impact: Users may have been unable to load the email remediation side panel in Threat Explorer.
More info: As a workaround, affected users may have been able to perform email remediation actions by following the steps below to the advanced hunting page instead:
Using the Microsoft Defender for Office 365 portal, go to the left navigation bar ‘Hunting’ and select the ‘Advanced Hunting’ option and select the ‘Take Action’ button. Also, users could choose “Take action” from the email entity or summary panel.
For further information, affected users can review our ‘Learn More’ additional resources:
https://learn.microsoft.com/en-us/microsoft-365/security/defender/advanced-hunting-take-action?view=o365-worldwide
https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/mdo-email-entity-page?view=o365-worldwide
Roadmap details: https://www.microsoft.com/en-in/microsoft-365/roadmap?filters=&searchterms=393937
Final status: We finalized the code fix and deployed it to the affected infrastructure to resolve impact. After a period of monitoring, we’ve confirmed that impact has been successfully remediated. In addition, the previously mentioned “Take action” feature in Office 365 Threat Explorer has been enabled for a select few by request, and is working as expected.
Scope of impact: Impact was specific to some users, who were served through the affected infrastructure, attempting to load the email remediation side panel in Threat Explorer within Microsoft Defender for Office 365.
Start time: Monday, April 22, 2024, at 10:14 AM UTC
End time: Wednesday, April 24, 2024, at 4:00 AM UTC
Root cause: A recent update to the service upon which this process relies introduced an issue, resulting in impact.
Next steps:
– We’re reviewing the affected infrastructure to determine what changes can be made to prevent similar issues from occurring again in the future.
This is the final update for the event.
