Introducing Service Principal and Managed Identity support on Azure DevOps - Azure DevOps Blog
Briefly

Angel Wong
This feature is in public preview.We are proud to announce that Service Principals and Managed Identities can now be used to authenticate with Azure DevOps.For those who have not heard of them before, these Azure Active Directory identities enable teams to gain access to your Azure DevOps organizations acting as their own application, not as a human user or service account.
Read at Azure DevOps Blog
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