Users may be unable to perform migrations

Title: Users may be unable to perform migrations User impact: Users may have been unable to perform migrations using the Migration Manager Platform (MMP) API. More info: Migrations that use the Migration Manager Platform (MMP) API were impacted. This includes migrations initiated from Microsoft 365 Admin Center and third-party migrations. Migrations using SPMT (SharePoint Migration Tool) were not impacted. Final status: We’ve finished the deployment of our fix to all impacted environments and have confirmed that impact is fully resolved. Scope of impact: Admins attempting to migrate using the Migration Manager Platform (MMP) API were impacted. Start time: Wednesday, October 21, 2026, at 9:49 AM UTC End time: Thursday, October 22, 2026, at 5:50 PM UTC Root cause: A configuration issue made components that facilitate migrations leveraging the MMP API unavailable, which prevented users from performing certain migrations. Next steps: - We're reviewing the affected system component configurations to identify improvements that could prevent similar issues from occurring. This is the final update for the event.

Title: Users may be unable to perform migrations User impact: Users may be unable to perform migrations using the Migration Manager Platform (MMP) API. More info: Migrations that use the Migration Manager Platform (MMP) API are impacted. These include migrations initiated from Microsoft 365 Admin Center and third-party migrations. Migrations using SPMT (SharePoint Migration Tool) are not impacted. Current status: We’ve completed the fix deployment to approximately 75% of our internal environment, where we are performing additional testing to ensure that no additional impact occurs. Once the internal validations are complete, we will start the deployment to the production infrastructures. Scope of impact: Admins attempting to migrate using the Migration Manager Platform (MMP) API are impacted. Root cause: A configuration issue has made components that facilitate migrations that leverage the MMP unavailable, which is preventing users from performing certain migrations. Next update by: Thursday, October 22, 2026, at 8:00 PM UTC

Title: Users may be unable to perform migrations User impact: Users may be unable to perform migrations using the Migration Manager Platform (MMP) API. More info: Migrations that use the Migration Manager Platform (MMP) API will be impacted. These include migrations initiated from Microsoft 365 Admin Center and third-party migrations. Migrations using SPMT (SharePoint Migration Tool) are not impacted. Current status: The fix has progressed through code validations and is being deployed to our internal environments for further testing. If the internal validations are successful, we’ll begin a broader rollout by our next scheduled update. Scope of impact: Admins attempting to migrate using the Migration Manager Platform (MMP) API will be impacted. Root cause: A configuration issue has made components that facilitate migrations that leverage the MMP unavailable, which is preventing users from performing certain migrations. Next update by: Thursday, October 22, 2026, at 4:00 PM UTC

Title: Users may be unable to perform migrations User impact: Users may be unable to perform migrations using the Migration Manager Platform (MMP) API. More info: Migrations that use the Migration Manager Platform (MMP) API will be impacted. These include migrations initiated from Microsoft 365 Admin Center and third-party migrations. Migrations using SPMT (SharePoint Migration Tool) are not impacted. Current status: We’re continuing to closely monitor service health as the deployment progresses through the validation and early deployment stages. We'll provide a resolution timeline as deployment progresses. Scope of impact: Admins attempting to migrate using the Migration Manager Platform (MMP) API will be impacted. Root cause: A configuration issue has made components that facilitate migrations that leverage the MMP unavailable, which is preventing users from performing certain migrations. Next update by: Thursday, October 22, 2026, at 12:00 PM UTC

Title: Users may be unable to perform migrations User impact: Users may be unable to perform migrations using the Migration Manager Platform (MMP) API. More info: Migrations that use the Migration Manager Platform (MMP) API will be impacted. These include migrations initiated from Microsoft 365 Admin Center and third-party migrations. Migrations using SPMT (SharePoint Migration Tool) are not impacted. Current status: We've resolved the integration issues identified during our previous validation and have started the release process for our updated build. We're progressing the fix through our deployment and validation stages, and we'll continue monitoring its health before deploying it more broadly to the affected infrastructure. We'll provide a resolution timeline as deployment progresses. Scope of impact: Admins attempting to migrate using the Migration Manager Platform (MMP) API will be impacted. Root cause: A configuration issue has made components that facilitate migrations that leverage the MMP unavailable, which is preventing users from performing certain migrations. Next update by: Thursday, October 22, 2026, at 8:00 AM UTC

Title: Users may be unable to perform migrations User impact: Users may be unable to perform migrations using the Migration Manager Platform (MMP) API. More info: Migrations that use the Migration Manager Platform (MMP) API will be impacted. These include migrations initiated from Microsoft 365 Admin Center and third-party migrations. Migrations using SPMT (SharePoint Migration Tool) are not impacted. Current status: Our internal validation checks found integration issues with the fix. We're taking steps to address those issues and ensure a comprehensive solution is included in the updated build version as intended. Once we confirm that, we'll start deploying the fix to the impacted infrastructure. We'll share an incident resolution timeline once it's available. Scope of impact: Admins attempting to migrate using the Migration Manager Platform (MMP) API will be impacted. Root cause: A configuration issue has made components that facilitate migrations that leverage the MMP unavailable, which is preventing users from performing certain migrations. Next update: Thursday, October 22, 2026, at 2:00 AM UTC

Title: Users may be unable to perform migrations User impact: Users may be unable to perform migrations using the Migration Manager Platform (MMP) API. More info: Migrations that use the Migration Manager Platform (MMP) API will be impacted. These include migrations initiated from Microsoft 365 Admin Center and third-party migrations. Migrations using SPMT (SharePoint Migration Tool) will not be impacted. Current status: The required internal deployment steps are taking longer than anticipated as we perform final validations to ensure the efficacy of our fix. Once internal validation is complete, we’ll begin deploying the fix to the impacted infrastructure. Scope of impact: Admins attempting to migrate using the Migration Manager Platform (MMP) API will be impacted. Next update: Wednesday, October 21, 2026, at 11:00 PM UTC

Title: Users may be unable to perform migrations User impact: Users may be unable to perform migrations using the Migration Manager Platform (MMP) API. More info: Migrations that use the Migration Manager Platform (MMP) API will be impacted. These include migrations initiated from Microsoft 365 Admin Center and third-party migrations. Migrations using SPMT (SharePoint Migration Tool) will not be impacted. Current status: We're continuing to perform extensive testing on the fix to ensure that it addresses the underlying issue without causing additional impact. Once the fix is validated, we'll start the deployment to the impacted infrastructure. Scope of impact: Admins attempting to migrate using the Migration Manager Platform (MMP) API will be impacted. Next update: Wednesday, October 21, 2026 at 7:00 PM UTC

Title: Users may be unable to perform migrations User impact: Users may be unable to perform migrations More info: Migrations that use Migration Manager Platform (MMP) API will be impacted. These include migrations initiated from Microsoft 365 Admin Center and third-party migrations. Migrations using SPMT (SharePoint Migration Tool) will not be impacted. Current status: We’ve identified a fix to address the underlying issue and are completing validation cycles to confirm that it resolves the impact without introducing additional risk. Once these checks are complete, we’ll begin deploying the fix to the affected environment. We’ll closely monitor service telemetry throughout the deployment to verify recovery and confirm that the fix is having the intended effect. We’ll provide a further update as deployment progresses. Scope of impact: Admins attempting to migrate using Migration Manager Platform (MMP) API will be impacted. Next update: Wednesday, October 21, 2026 at 4:00 PM UTC

Title: Users may be unable to perform migrations User impact: Users may be unable to perform migrations More info: Migrations that use Migration Manager Platform (MMP) API will be impacted. These include migrations initiated from Microsoft 365 Admin Center and third-party migrations. Migrations using SPMT (Sharepoint Migration Tool) will not be impacted. Current status: After reviewing telemetry data, we’ve identified the source of the issue and have narrowed our investigation to the specific conditions contributing to the impact. We’re now assessing the most effective mitigation options and determining the actions required to restore normal service as quickly and safely as possible. Next update: Wednesday, October 21, 2026 at 1:00 PM UTC