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.