Microsoft 365 Alert – Service Degradation – Microsoft 365 suite – Some users with conditional access policies may be unable to access any Microsoft 365 service – RESOLVED

21/03/2023 16:05:00 PM (GMT)

NHSmail Reference : INC34945721

Microsoft Reference : MO531859

Issue Status : RESOLVED

Issue Description : Some users with conditional access policies may be unable to access any Microsoft 365 service.

More Information : Affected users’ conditional access policies may be denying access requests due to user’s geo-locations being inaccurate.

Final Update : 24/03/2023 08:28:00 AM – Microsoft have completed their mitigation efforts and have confirmed that reverting the offending update as well as performing traffic redirections has resolved impact to all users.

Scope of impact : Impact is specific to some users with conditional access policies applied attempting to access any Microsoft 365 service.

Root cause : A recent update applied to a section of infrastructure responsible for regulating user geo-location may be inadvertently causing impact.

Next steps : Microsoft are continuing to monitor telemetry to ensure the service remains stable. They’re reviewing why impact wasn’t detected prior to the update being rolled out to prevent similar issues in the future.