Azure DevOps organizations connected to Microsoft Entra can accumulate ghost users with email prefixes like OIDCONFLICT_UpnReuse_{OID}. These duplicated users are invisible in the Web UI and standard CLI/graph queries, making them hard to detect and remove. A PowerShell script using the Azure DevOps Graph API is provided to identify and delete these conflicting user entries, since the Web UI offers no way to remove them.
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