Microsoft 365 Alert – Service Degradation – Exchange Online – Users can’t override Microsoft Purview Data Loss Prevention rules in Outlook on the web – RESOLVED

01/12/2023 08:25:00 AM

NHSMail Reference: INC39959576

Microsoft Reference: EX694498

Issue Status: RESOLVED

Issue Description: Users can’t override Microsoft Purview Data Loss Prevention rules in Outlook on the web.

More info: Users don’t see an override window popup to override the Data Loss Prevention rules, which subsequently prevents them from sending email in Outlook on the web.

Additionally, as a workaround, admins can update the organizational policy based on your organization’s legal and compliance policy or users can utilize the Outlook client.

Final Update: 03/01/2024 07:36:00 AM – Microsoft deployed the fix to the impacted environments and confirmed with monitoring telemetry that the impact is remediated.

Scope of impact: Impact may occur for all users where they can’t override Data Loss Prevention rules in Outlook on the web.

Root cause: A recent update aimed at resolving a problem with the DLP override window that wasn’t displaying correctly, caused a compatibility issue and resulted in impact.

Next steps: Microsoft are further reviewing the recent update to understand how the compatibility issue was introduced, and to understand what prevented it from being detected in their update testing and validation procedures, which will allow them to prevent similar issues in future updates.