Microsoft 365 Alert – Service Degradation – Exchange Online – Some users’ email messages may be delayed when being sent through Exchange Online – RESOLVED

29/07/2024 08:50:00 AM

NHSmail Reference: INC44642497

Microsoft Reference: EX837403

Issue Status: RESOLVED

Issue Description: Some users’ email messages may be delayed when being sent through Exchange Online.

More info: Users” email messages may have been delayed when being sent through Exchange Online.

Final Update: 29/07/2024 08:50:00 AM – Microsoft have reviewed their service telemetry data and identified a portion of Exchange Online infrastructure that handles authentication requests encountered a communication problem. They’ve restarted the authentication process for the affected portion of infrastructure and monitored telemetry to confirm the impact is remediated.

Scope of impact: Some users serviced by the affected infrastructure whose email messages were being delayed when sent through Exchange Online may have been impacted.

Root cause: A portion of Exchange Online infrastructure that handles authentication requests encountered a communication problem.

Next steps: Microsoft are investigating methods that will help us better identify the potential for impact to portions of infrastructure that are at risk of encountering a communication problem so they can drive service improvements and prevent similar issues from happening in the future.