Microsoft 365 Alert – Service Degradation – Exchange Online – Users may be unable to send emails with attachments that trigger the Microsoft Purview Data Loss Prevention (DLP) policy – RESOLVED

23/10/2024 08:30:00 AM

NHSmail Reference: INC46439570

Microsoft Reference: EX916505

Issue Status: RESOLVED

Issue Description: Users may be unable to send emails with attachments that trigger the Microsoft Purview Data Loss Prevention (DLP) policy.

More Info: Affected messages were held in the ”drafts” folder.

Final Update: 23/10/2024 08:30:00 AM –  Following Microsoft’s change reversion processes, their verifications with affected users has confirmed that impact has been remediated.

Scope of impact: : Impact was specific to users sending email messages from Outlook on the web that included attachments that triggered the DLP policy.

Root cause: A recent service update which intended to improve our Microsoft Purview Data Loss Prevention introduced an impacting code regression.

Next steps: Microsoft are further analyzing the offending service update along with the introduced code regression to help them isolate similar problems during their pre-deployment testing and validation processes.

back to top