Microsoft 365 Alert – Service Degradation – OneDrive for Business – Some users may be intermittently unable to access OneDrive for Business content – RESOLVED

27/01/2025 11:06:00 AM

NHSmail Reference: INC48279316

Microsoft Reference: OD989368

Issue Status: RESOLVED

Issue Description: Users may be intermittently unable to access OneDrive for Business content.

Final Update 03/02/2025 08:28:00 AM The deployment of the fix has completed and Microsoft have confirmed by utilizing internal monitoring telemetry to confirm that impact is remediated.

Scope of impact: Impact is specific to some users who are served through the affected infrastructure.

Root cause: A newly added code stream that exceeded size limitations has caused a subset of service infrastructure that helps facilitate access to OneDrive for Business content to drop below our manageable service performance thresholds, resulting in impact.

Next steps: Microsoft are reviewing their update validation procedure to help identify and prevent similar code stream size issues in the future.

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