The AB-400 training is for developers who step in where low-code stops. Power Platform covers many business needs, but a serious project always ends up asking for a Dataverse plug-in, a custom interface component, a connector to an internal API or an agent that acts inside the application. This course, the official successor to PL-400, teaches you to extend Power Platform with code and to integrate AI into it, cleanly and in a maintainable way.
You design the technical architecture of a solution, set up ALM with pipelines and Build Tools, write client scripts and PCF components, then discover Power Apps code apps. On the server side, you develop plug-ins and custom APIs, call the Dataverse Web API, offload heavy processing to Azure Functions and build custom connectors. The course finally brings in Microsoft Foundry and Copilot Studio agents, and prepares you for the AB-400 exam.
Module 1: Design the technical architecture
Module 2: Design solution components
Module 3: Implement application lifecycle management (ALM)
Module 4: Apply business logic in model-driven apps
Module 5: Create PCF code components
Module 6: Build Power Apps code apps
Module 7: Deploy and manage Power Apps code apps
Module 8: Create a Dataverse plug-in
Module 9: Perform operations by using platform APIs
Module 10: Process workloads by using Azure Functions
Module 11: Configure Power Automate cloud flows and Copilot Studio workflows
Module 12: Build Microsoft Foundry agents that integrate with Power Platform
Module 13: Publish and consume Dataverse events
Module 14: Implement synchronization for Dataverse data
Module 15: Create custom connectors
Microsoft retires the PL-400 Microsoft Power Platform Developer course on 30 October 2026. AB-400 is its official replacement and keeps the same certification, Microsoft Certified: Power Platform Developer Associate, now earned through the AB-400 exam. The change goes beyond the number. PL-400 trained a developer to fill the gaps of low-code. AB-400 trains a developer who designs solutions where code, Dataverse data and AI agents work together.
The course also goes from five days to three. The foundations remain: plug-ins, the Dataverse Web API, PCF components, client scripting, custom connectors and ALM. They are covered more tightly to make room for what is new in the platform.
Three topics arrive. Power Apps code apps let you build an interface entirely in code, with your usual framework, while still benefiting from Power Platform connections, Dataverse data and governance. MCP servers expose Power Platform data and actions to agents. Finally, a whole skill group covers Microsoft Foundry agents built in code and connected to Power Platform, and consuming Copilot Studio agents from an application.
Architecture also carries more weight. Before writing a line, you have to decide: code or standard configuration, plug-in or flow, standard or virtual table, Foundry or Copilot Studio. These trade-offs account for up to a fifth of the exam.
Industrialisation is the third thread of the course. Power Platform Pipelines and Build Tools automate moving from one environment to the next, environment variables remove hard-coded values, and managed identity replaces secrets stored in plug-ins and Azure Functions. These are exactly the points that separate an extension that works in a demo from one a team can maintain for years.
The AB-400 exam assesses four areas, with an indicative weight published by Microsoft:
The heaviest block, extending the platform, groups plug-ins, APIs, Azure Functions, advanced flows and Foundry agents. It is also where hands-on experience makes the difference. The exam is booked with Microsoft and remains optional.
If your role is to assemble applications and agents without writing code, the Build intelligent applications (AB-410) training is the right entry point, and an excellent preparation for AB-400. If you mostly build agents in Copilot Studio, the Design and build integrated AI agent solutions in Copilot Studio (AB-620) training is a better fit. To build AI applications in code directly on Azure, look at Develop AI apps and agents on Azure (AI-103).
The pace is fast: fifteen skill groups in three days. Come with a development environment you know well, Visual Studio Code or Visual Studio, and refresh your Dataverse basics if you have not used it recently. Ideally, bring a real extension in mind, a plug-in to write or an integration to build, so you can test each module against your own need. The labs stay available for 180 days after the session, which leaves time to replay the exercises before the exam.
I am PL-400 certified: should I take AB-400?
Your certification stays valid until it expires and is renewed on Microsoft Learn. AB-400 becomes the reference exam for the same certification: the training brings you up to date on code apps, MCP and agents, which are part of the renewal assessment.
Why three days instead of five for PL-400?
Microsoft tightened the course around the skills assessed by the AB-400 exam. The foundations are still there, but without the long platform discovery sequences. That is why prior Power Platform experience is expected.
Which languages are used during the course?
Mainly JavaScript and TypeScript for the interface and C# for plug-ins, with Power Fx, JSON and YAML depending on the module. Python appears with the Dataverse SDK. You do not need to master all of them, but you do need to be able to read code.
Does the course cover Power Pages?
Power Pages is part of the ecosystem presented, but the exam and the course focus on Dataverse, model-driven apps, code apps, flows and integrations.
Do I need an Azure subscription?
Not during the training: the exercises run in the official Microsoft labs. To reproduce the Azure Functions, Application Insights or Microsoft Foundry modules at work, however, you will need an Azure subscription in addition to your Power Platform environment.
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