Investigating - We are reissuing this incident statement as Microsoft has recently made the change and we have seen many tenants that have not migrated. Below is the original incident language that was sent in February 2026.
Cohesity is issuing this advisory to inform our Cloud Protection Service (CPS) customers of an important change regarding authentication for Microsoft 365 workflows. Microsoft is retiring Azure Access Control Service (ACS), effective April 2, 2026. Currently, ACS is utilized for authentication in certain Microsoft 365 workflows, including backups for SharePoint, OneDrive, Teams, and Groups.
After April 2, 2026, backups for these protection jobs will fail unless customers migrate to Certificate-Based Authentication (CBA). To ensure uninterrupted service and data protection, we strongly recommend that all customers review the provided Knowledge Base (KB) article and follow the migration instructions.
This impacts all regions and all CCS customers.
Recommended Action:
All recipients of this Field Notice are advised to review the KB article from the additional Resources section for detailed information and recommended preventive actions.
KB article: https://support.cohesity.com/s/article/Steps-to-enable-CBA-Migration-for-CPS
Microsoft change announcement: https://learn.microsoft.com/en-us/sharepoint/dev/sp-add-ins/retirement-announcement-for-azure-acs
Jul 16, 2026 - 19:32 UTC
Cohesity is issuing this advisory to inform our Cloud Protection Service (CPS) customers of an important change regarding authentication for Microsoft 365 workflows. Microsoft is retiring Azure Access Control Service (ACS), effective April 2, 2026. Currently, ACS is utilized for authentication in certain Microsoft 365 workflows, including backups for SharePoint, OneDrive, Teams, and Groups.
After April 2, 2026, backups for these protection jobs will fail unless customers migrate to Certificate-Based Authentication (CBA). To ensure uninterrupted service and data protection, we strongly recommend that all customers review the provided Knowledge Base (KB) article and follow the migration instructions.
This impacts all regions and all CCS customers.
Recommended Action:
All recipients of this Field Notice are advised to review the KB article from the additional Resources section for detailed information and recommended preventive actions.
KB article: https://support.cohesity.com/s/article/Steps-to-enable-CBA-Migration-for-CPS
Microsoft change announcement: https://learn.microsoft.com/en-us/sharepoint/dev/sp-add-ins/retirement-announcement-for-azure-acs
Jul 16, 2026 - 19:32 UTC
Update - We are continuing to investigate this issue.
Jun 03, 2026 - 19:49 UTC
Jun 03, 2026 - 19:49 UTC
Update - We continue to work with the AWS team to address issues in ME-Central-1 & ME-South-1 regions. We will continue to provide updates as we get more from our cloud provider.
Mar 05, 2026 - 17:26 UTC
Mar 05, 2026 - 17:26 UTC
Update - We are closely working with the AWS team to address issues in ME-Central-1 & ME-South-1 regions. We will continue to provide updates as we get more from our cloud provider.
Mar 03, 2026 - 10:53 UTC
Mar 03, 2026 - 10:53 UTC
Investigating - We are currently experiencing an impact to our backend infrastructure in AWS ME-Central-1 region due to operational issues with our primary cloud provider (AWS).
Our team is actively monitoring the situation and working to minimize any disruption. We will share updates here as soon as we have more information on resolution and restored availability
Mar 02, 2026 - 10:26 UTC
Our team is actively monitoring the situation and working to minimize any disruption. We will share updates here as soon as we have more information on resolution and restored availability
Mar 02, 2026 - 10:26 UTC
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