Microsoft 365 Alert – Service Degradation – Microsoft 365 suite – Multiple issues with the Defender and Exchange Online Protection (EOP) services – RESOLVED

Announcements Sourav Nandi

20/10/2023 16:10:00 PM

NHSmail Reference: INC39012093

Microsoft Reference: MO682747

Issue Status: RESOLVED

Issue Description: Multiple issues with the Defender and Exchange Online Protection (EOP) services.

More info: Impact includes, but is not limited to:

– Quarantined emails notifications are delayed
– Delays or errors with Policy change propagation for different services
– Detection, Message Tracing and reporting may be delayed
– Advances Hunting reports may be delayed

Final Update: 23/10/2023 08:57:00 AM – Microsoft confirmed that the change reversion has completed successfully, and their telemetry shows that impact has been remediated.

Scope of impact: Any user hosted out of the affected infrastructure may have experienced impact when attempting to perform any of the functionalities outlined in the More info section of this communication.

Root cause: A recent update led to a code regression within a portion of infrastructure responsible for facilitating some Defender and Exchange Online protection functionalities.

Next steps: Microsoft are investigating how the recent update led to a code regression within a portion of infrastructure responsible for facilitating some Defender and Exchange Online protection functionalities to prevent this problem from happening again.