AB-400 Practice Tests and Exam Guide for Microsoft Power Platform Developer

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.

What Changed from PL-400 to AB-400?

AB-400 keeps the Power Platform developer foundation but expands it significantly toward code-first development and AI-enabled solutions.

Major additions and changes include:

• Power Apps code apps
• Generative pages
• Microsoft Foundry agents
• Copilot Studio workflows
• Model Context Protocol (MCP)
• Custom agents integrated with Power Platform
• Modern Dataverse APIs and SDK usage
• Stronger ALM and CI/CD coverage
• Increased emphasis on architecture and solution design
• Greater focus on extensibility and AI-assisted business logic

Microsoft’s change log marks Power Apps code apps and Microsoft Foundry agents as new areas, while Power Automate now explicitly includes Copilot Studio workflows and the platform-extension domain receives increased weighting.

A useful way to think about the shift is:

PL-400: Extend Power Platform with code
AB-400: Extend Power Platform with code + agents + generative AI + modern integration patterns

Who Should Take the AB-400 Exam?

AB-400 is best suited for Power Platform developers who build custom business applications and integrations rather than relying entirely on out-of-the-box configuration.

Microsoft expects candidates to have development experience with:

• Microsoft Power Platform
• JavaScript, JSON, TypeScript, and Power Fx
• C#, Python, HTML, and YAML
• RESTful Web APIs
• Microsoft Azure
• Microsoft Foundry
• Microsoft Copilot Studio

Typical candidates include Power Platform developers, application developers, solution developers, technical consultants, and professionals who build custom Power Apps, Dataverse extensions, integrations, automations, or agentic AI solutions.

AB-400 Exam Domains

The current AB-400 blueprint contains four major skill areas:

The largest domain is Extend Microsoft Power Platform at 35–40%, followed by Extend the user experience at 25–30%. Together, those two areas can account for roughly two-thirds of the exam.

AB-400 Exam Domains

1. Build Microsoft Power Platform Solutions — 15–20%

This domain focuses on designing the technical architecture of Power Platform solutions and selecting the right implementation approach. Candidates should understand when to use built-in platform capabilities, client-side logic, Dataverse features, cloud services, automation, Power Apps code apps, generative pages, PCF components, custom connectors, MCP-based integrations, and ALM practices.

2. Extend the User Experience — 25–30%

This section covers creating more advanced and customized user experiences in Power Apps. Key areas include JavaScript, Power Fx, the client API object model, Dataverse Web API, commands, navigation, notifications, PCF components, and Power Apps code apps. Candidates should also understand deployment, monitoring, Content Security Policy, and performance optimization for code-based apps.

3. Extend Microsoft Power Platform — 35–40%

This is the largest exam domain and focuses on extending the platform with custom business logic and AI-enabled functionality. Candidates should understand Dataverse plug-ins, execution context, custom APIs, business events, Dataverse SDKs, Web API, OAuth, Azure Functions, Power Automate, Copilot Studio workflows, and Microsoft Foundry agents integrated with Power Platform.

4. Develop Integrations — 10–15%

This domain focuses on connecting Power Platform solutions with external systems and services. Candidates should understand Dataverse events, webhooks, Azure Service Bus, Azure Event Hub, change tracking, alternate keys, upsert operations, custom connectors, authentication, OpenAPI definitions, policy templates, Azure Functions, and data transformation for integration scenarios.

PL-400 Candidates: Can You Reuse Your Existing Knowledge?

Yes. Candidates who already prepared for PL-400 should not discard that knowledge.

Strong PL-400 knowledge remains useful in areas such as:

• Dataverse
• Plug-ins
• PCF components
• Power Automate
• Azure Functions
• Custom connectors
• ALM
• Integration patterns

However, AB-400 requires additional preparation around:

• Power Apps code apps
• Generative pages
• Microsoft Foundry
• Copilot Studio workflows
• Agentic AI
• MCP integrations
• Modern API and developer tooling

Microsoft’s change log shows several major changes and new objectives rather than a simple exam-code rename.

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.

Prepare Effectively for the AB-400 Exam

The AB-400 Extending Microsoft Power Platform Solutions with Code and AI exam represents a significant evolution of the Power Platform Developer Associate certification. While familiar skills such as Dataverse development, plug-ins, APIs, Power Automate, Azure Functions, and ALM remain important, the new exam adds much stronger emphasis on Power Apps code apps, generative AI, Copilot Studio, Microsoft Foundry agents, and MCP-based integrations.

A strong preparation strategy should combine the official Microsoft study guide, hands-on Power Platform development, experimentation with AI and agent integrations, and updated Microsoft Power Platform Developer AB-400 Practice Tests from Passcert. If you previously studied for PL-400, reuse that foundation—but make sure your preparation reflects the new AI-powered development model introduced by AB-400.