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  A developer attempts to push code to a repository. They are confirmed members of the standard Contributors group. Despite this, their terminal returns the   TF401027 Azure DevOps error , stating they lack the required permissions. The push fails, development stalls, and the security configuration appears contradictory. When an  Azure Repos push rejected  event occurs under these conditions, the issue is rarely a missing basic group assignment. Instead, it is a conflict within the Azure DevOps security evaluation hierarchy. This guide explores the root cause of this error, details how Azure DevOps evaluates repository access control lists (ACLs), and provides exact remediation steps to restore push access. Understanding the Root Cause of TF401027 To fix the issue, you must understand how Azure DevOps repository security functions under the hood. The  Git GenericContribute permission  maps to the "Contribute" state in the Azure DevOps graphical interface. I...