AB-400 Explained: Dataverse API Clients and OAuth Authentication

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Learn how to choose Dataverse API clients and OAuth authentication patterns in this AB-400 Explained session. Explore delegated user access and server-to-server application access, configure Dataverse Application Users, and verify connections before building integration logic. Diagnose failures by separating token acquisition, caller identity, and data permissions. Topics covered: • Choosing between Xrm.WebApi, Dataverse Web API, and the SDKs for .NET and Python • Delegated access with the /user_impersonation scope • Application access with the /.default scope • Microsoft Entra app registrations and Dataverse Application Users • Environment-specific setup and least-privilege security roles • Token acquisition using MSAL or Azure Identity • WhoAmI verification against the intended caller • Bounded test reads and disposable write tests • Troubleshooting token, identity, data access, and deployment failures • Identity patterns for interactive dashboards and unattended batch services For learners preparing for AB-400 and developers building external applications that connect to Microsoft Dataverse. #AB400 #Dataverse #OAuth