Microsoft 365 Alert – Service Degradation – Exchange Online – Users’ Data Loss Prevention (DLP) policy approved email messages aren’t being delivered or are encountering delays – RESOLVED

Announcements Sourav Nandi

15/06/2023 08:50:00 AM (GMT)

NHSmail Reference : INC36401858

Microsoft Reference : EX587332

Issue Status : RESOLVED

Issue Description : Users’ Data Loss Prevention (DLP) policy approved email messages aren’t being delivered or are encountering delays.

More info : Users’ DLP policy approved email messages aren’t being delivered or are encountering delays in Exchange Online.

Final Update : 27/06/2023 08:35:00 AM – The deployment of Microsoft’s fix has completed, and the issue is resolved for all users.

Scope of impact : This issue may affect any user attempting to send or receive email messages that require DLP policy approvals.

Root cause : A recent change introduced a regression which caused certain DLP properties to be incorrectly indexed. This resulted in our Event Based Assistants receiving a signal stating something critical is occurring when attempting to access the database to approve requests, resulting in restarts and impact.

Next steps : Microsoft are reviewing their update validation procedure to prevent similar indexing issues from being introduced in the future.