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The AB-400 Extending Microsoft Power Platform Solutions with Code and AI exam is the updated developer certification exam for professionals building advanced business solutions with Microsoft Power Platform. To support effective preparation, the latest Microsoft Power Platform Developer AB-400 Practice Tests from Passcert cover the core knowledge concepts measured by the new exam, including Power Platform solution architecture, Power Apps code apps, PCF components, Dataverse plug-ins and APIs, Power Automate, Microsoft Copilot Studio, Microsoft Foundry agents, MCP integrations, Azure Functions, ALM, and custom connectors. Combined with Microsoft Learn, hands-on development, and regular practice, these questions can help candidates identify weak areas and prepare more confidently for the Microsoft Certified: Power Platform Developer Associate certification.

What Is the AB-400 Exam?
AB-400 is the new exam for the Microsoft Certified: Power Platform Developer Associate certification. Microsoft describes it as validating the ability to design, develop, test, and troubleshoot AI-powered business solutions using Microsoft Power Platform, with an emphasis on generative AI, custom development, automation, integrations, and modern developer tools.

Candidates are expected to implement custom user experiences and business logic, system integrations, data transformations, process automation, Power Automate expressions, and agentic AI as part of solution logic. The role also requires practical familiarity with Power Platform services, authentication and security, ALM, Power Platform CLI, Visual Studio/VS Code, and AI-assisted development tools.

AB-400 Replaces PL-400
Microsoft is transitioning PL-400 Microsoft Power Platform Developer to AB-400 Power Platform Developer Associate as part of an update to its certification portfolio.

The key transition dates are:
– October 16, 2026: PL-400 registration closes and registration opens exclusively for AB-400.
– Candidates who registered for PL-400 on or before October 16 can continue scheduling and taking PL-400 through October 30, 2026.
– The updated AB-400 exam becomes available beginning October 16, 2026.

For candidates beginning their preparation now, AB-400 should be the primary study target.

Best Study Tips for the Microsoft AB-400 Exam
1. Start with the Updated AB-400 Blueprint
Do not prepare using the old PL-400 weighting alone. Use the four new AB-400 domains to organize your study time, especially the 35–40% Platform Extension domain.

2. Practice Real Power Platform Development
Build small solutions that use Dataverse plug-ins, PCF components, code apps, Power Automate, Azure Functions, and custom connectors. Hands-on development helps connect individual technologies into complete solutions.

3. Learn the New AI and Agent Features
Spend additional time on Microsoft Foundry, Copilot Studio, MCP, generative pages, and agent integrations. These areas are among the clearest differences between AB-400 and PL-400.

4. Strengthen API, Security, and ALM Skills
Review Dataverse APIs, OAuth, managed identities, retry policies, solution dependencies, environment variables, Pipelines, Build Tools, and monitoring.

5. Use Updated AB-400 Practice Tests
Use current AB-400 Practice Tests from Passcert after reviewing each domain. Focus on scenario-based questions that require you to decide where to implement business logic, which extensibility model to use, or how to integrate Power Platform with AI and external services.