AB-400

Microsoft AB-400 is the exam for the Microsoft Certified: Power Platform Developer Associate certification. It tests the development skills needed to design, build, test, and troubleshoot Microsoft Power Platform extensions and AI-powered business solutions.

The exam covers custom user experiences, Dataverse code, automation, integrations, ALM, Power Apps code apps, Copilot Studio workflows, and agents built with Microsoft Foundry. It is intended for developers who combine low-code services with professional development tools and APIs.

Page Contents

• AB-400 Exam Overview
• Exam Information
• Target Audience and Experience
• Exam Objectives
• Skills and Technologies Covered
• AB-400 and PL-400 Transition
• Preparation Priorities
• Common Preparation Mistakes
• Frequently Asked Questions
• AB-400 Study Materials
• Disclaimer

AB-400 Exam Overview

AB-400 expands the Power Platform developer role into code apps, generative pages, agentic AI, Model Context Protocol (MCP), Microsoft Foundry, and Copilot Studio. Traditional developer topics remain important, including Dataverse plug-ins, client scripting, PCF components, platform APIs, Azure Functions, custom connectors, and event-driven integrations.

The questions are likely to combine architecture and implementation decisions. Candidates should know when built-in Power Platform features are enough and when a requirement calls for code, an API, an Azure service, a custom connector, or an agent.

AB-400 Exam Information

Who Should Take the AB-400 Exam?

AB-400 is intended for developers who extend Microsoft Power Platform with custom code, APIs, automation, Azure services, and AI agents. Relevant roles include Power Platform developers, Dataverse developers, solution developers, integration developers, and consultants responsible for technical implementation.

Candidates should have practical knowledge of Power Platform capabilities, limits, authentication, security, ALM, Power Platform CLI, Visual Studio, and Visual Studio Code. The official profile also expects experience with JavaScript, JSON, TypeScript, Power Fx, C#, Python, HTML, YAML, REST APIs, Azure, Microsoft Foundry, and Copilot Studio.

AB-400 Exam Objectives

Skills and Technologies Covered

Candidates should be able to design a Power Platform solution before writing code. This includes choosing the right table type, deciding where business logic belongs, planning authentication and authorization, accounting for data policies and managed environments, and selecting an appropriate user experience.

Implementation work includes model-driven app scripting, PCF components, code apps, Dataverse plug-ins, custom APIs, Azure Functions, cloud flows, connectors, event endpoints, and data synchronization. The updated blueprint also includes generative pages, Copilot Studio workflows, Microsoft Foundry agents, MCP servers, MCP app widgets, and Work IQ.

AB-400 and PL-400 Transition

Do not assume that old PL-400 exam logistics or study coverage automatically apply to AB-400. The AB-400 blueprint adds substantial coverage of code apps, agentic solutions, Microsoft Foundry, Copilot Studio, and MCP-based integration.

AB-400 Preparation Priorities

• Give the most time to Extend Microsoft Power Platform, which carries 35-40 percent.
• Build and debug a Dataverse plug-in that uses execution context, images, the Organization service, and a custom API.
• Practice model-driven app scripting, PCF lifecycle events, and Power Apps code-app deployment.
• Review OAuth, managed identities, service principals, throttling, concurrency, transactions, and bulk operations.
• Create a cloud flow with filtering, retry policies, error handling, and a reusable child flow.
• Map the roles of Copilot Studio, Microsoft Foundry, MCP servers, agents, and Dataverse data access.
• Review ALM with solutions, environment variables, layers, pipelines, and Power Platform Build Tools.

Common Preparation Mistakes

Using Custom Code Before Checking Built-in Features

The architecture objectives explicitly ask candidates to decide whether standard Power Platform functionality can meet a requirement. Code adds maintenance and security work, so it should solve a real gap.

Treating Every AI Topic as the Same Product

Microsoft Foundry, Copilot Studio, custom agents, MCP servers, MCP widgets, and Work IQ have different roles. Study how they connect instead of grouping them under a single AI label.

Ignoring Nonfunctional Requirements

A solution can work and still be a poor answer if it mishandles security, throttling, deployment, monitoring, concurrency, or performance. Scenario questions often depend on these constraints.

Overlooking the Code-App Objectives

Building, deploying, sharing, monitoring, debugging, and optimizing Power Apps code apps are explicit AB-400 skills. Older PL-400 preparation may not cover them adequately.

Memorizing Percentages as Exact Question Counts

Microsoft publishes weight ranges, not a fixed number of questions per domain. Use the ranges to allocate study time without trying to calculate an exact item count.

Frequently Asked Questions

Is AB-400 simply a renamed PL-400 exam?

No. The certification remains Power Platform Developer Associate, but the updated blueprint adds and expands code apps, AI agents, Copilot Studio workflows, Microsoft Foundry, MCP, and modern development practices.

How much AI development is on the exam?

AI appears in architecture, user experience, workflow, agent, and integration objectives. It is part of the exam, but the blueprint also contains substantial Dataverse, API, PCF, ALM, Azure, automation, and connector coverage.

Should I study both C# and JavaScript?

Yes. C# is relevant to Dataverse plug-ins and .NET integrations, while JavaScript is used for model-driven app client scripting and command behavior. The audience profile also lists TypeScript, Python, Power Fx, and other development formats.

What should I build in a practice environment?

A useful project combines a Dataverse solution, client scripting or PCF, a plug-in or custom API, a cloud flow, an Azure Function, and an external integration. Add monitoring and move the solution through an ALM pipeline.

How often can the objectives change?

Microsoft updates role-based exams periodically as products and job requirements change. Check the official study guide and its change log before scheduling and again near the exam date.

Prepare with AB-400 Study Materials

CertQueen AB-400 preparation materials follow the four official skill domains and focus on the development and architecture decisions described in the current Microsoft study guide.

• Coverage of all four official domains and weight ranges
• Practice with Dataverse, Power Apps, Power Automate, Azure, and integration scenarios
• Review of code apps, Copilot Studio, Microsoft Foundry, MCP, and agent development
• PDF and practice-software options where listed on the product page
• 12 months of free content updates, with an optional upgrade to 24 months for $10

The standard package includes 12 months of free content updates from the purchase date. Customers can extend the update period to 24 months for an additional $10.

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Disclaimer

CertQueen is an independent exam-preparation provider and is not affiliated with or endorsed by Microsoft. Exam details and policies can change. Microsoft, Power Platform, Power Apps, Dataverse, Azure, Copilot, certification names, and related trademarks belong to their respective owners.