Is the AB-400 Harder Than the PL-400? A PL-400 Trainer Weighs In

2026 has been a big year for Power Platform certifications, and the latest exam to change is the PL-400. It has been replaced by the AB-400 exam, Extending Microsoft Power Platform Solutions with Code and AI. I’m not a developer, so this isn’t an exam I can advise you on myself, but at the Power Platform Community Conference I sat down with someone who just took it: Nathalie Leenders, a Microsoft MVP and Power Platform consultant and trainer at Wortell.

Key takeaways

• The AB-400 replaces the PL-400 as the exam for the Power Platform Developer Associate certification, and it goes much deeper into code than the PL-400 did.
• New topics include Power Apps code apps, AI-assisted app building, MCP servers and PCF components combined with AI, on top of the model-driven apps and Dataverse work you already know.
• If you already hold the Power Platform Developer Associate certification, you don’t need to take the AB-400 to keep it.
• Nathalie doesn’t recommend the AB-400 as a first exam, or to anyone who isn’t a developer: she suggests at least six months of hands-on experience first.
• Her biggest tip is to go through every objective in the study guide and get hands-on with anything you haven’t used yet.

Why Nathalie took the AB-400 after the PL-400

What I found impressive is that Nathalie already had the PL-400 and took the AB-400 anyway, just to stay up to date. The PL-400 was actually the very first certification she ever did. She took it as a challenge, with a free voucher from a Microsoft Ignite Cloud Skills Challenge, and she’s honest that she doesn’t recommend that route to anyone.

The PL-400 was, and still is, the most technical Power Platform exam out there. As Nathalie put it, it’s about extending: “So it’s JavaScript, it’s plug-ins, it’s Dataverse. It’s way beyond the standard capabilities of model-driven apps.”

Microsoft was also very quiet about the switch. There was no blog post announcing the AB-400. I only found out because I have some automations that watch the Microsoft Learn pages, and they told me the PL-400 was retiring. Nathalie had been expecting an announcement too, and instead the exam was just there.

What changed in the AB-400 exam

Nathalie took the AB-400 to see what Microsoft now considers “extending” the Power Platform, because the technology has changed so much. She went in prepared for technical questions, but not as technical as they actually were, and it caught her by surprise. As she joked, they extended the scope of the extending exam.

It’s still model-driven apps and it’s still Dataverse, but the exam goes much deeper and adds Power Apps code apps and AI-assisted app building. The questions changed too. The PL-400 had a bit of JavaScript and TypeScript, while the AB-400 shows you a piece of code with a few options, and asks you to choose the right ones and put them in the correct order.

Microsoft’s study guide shows the same shift. The AB-400 is split into four skill areas:

• Build Microsoft Power Platform solutions (15-20%)
• Extend the user experience (25-30%)
• Extend Microsoft Power Platform (35-40%)
• Develop integrations (10-15%)

That’s why Nathalie’s advice is clear: if you’re not a developer, don’t take the developer exam this time. Even with her experience building plug-ins and JavaScript, and having taught the PL-400 course, she just about didn’t pass, and she’s going to take it again. She told me she was one checkbox on one question away. That has happened to me a couple of times as well, and I’ve also passed an exam by one checkbox, so it all balances out.

Do you need the AB-400 if you already have the PL-400?

No. The certification doesn’t change: it’s still the Power Platform Developer Associate. If you passed the PL-400, you don’t need the AB-400 to keep being a certified Power Platform developer.

Nathalie took it because she loves certifications, and because she wanted to see which direction Microsoft would take the exam. The catch is that the exam is so new that, when we recorded in late October 2026, there was no learning path and no practice exam yet, only the study guide listing the new topics.

That’s always a challenge with a brand-new exam. Early on, an exam can include content that eventually gets removed as it becomes more balanced, so taking it at the beginning is usually a tougher challenge.

What to get hands-on with before the AB-400 exam

I asked Nathalie what someone who passed the PL-400 a couple of months ago should open a lab and actually try. Her list:

• Code apps and AI-assisted app building. You can create an app from a prompt, but she suggests going further into the code itself.
• Visual Studio Code connected to the Power Platform. Connect to Power Apps and to an MCP server, and dive into code apps from there.
• PCF components combined with AI. The PL-400 focused heavily on extending model-driven apps, Dataverse plug-ins and JavaScript, and the AB-400 goes much deeper into all of that.

There’s a lot of content in the AB-400 that wasn’t in the PL-400. That makes it more fun in a way, but it also goes very deep.

Does the AB-400 match what companies are building?

I asked Nathalie whether the exam lines up with what organizations are building today, or whether it’s more of a Microsoft wish list. Her answer was that it’s a little bit of both.

Microsoft is pushing toward this as the future, but the exam is still heavily model-driven apps, the experience we’re used to, enhanced much more with AI. And companies want to build apps very quickly. In her words: “We used to develop model-driven apps. It would take us weeks to do what we can now do in an hour with AI, and with the generative pages in model-driven apps.” Being able to enhance that with code is what the exam leans toward, and she thinks that’s both what Microsoft wants and what companies are looking for right now.

If you want to see where Microsoft is taking the platform next, my PPCC 2026 keynote highlights cover the biggest announcements from the same conference where Nathalie and I sat down.

Should the AB-400 be your first Power Platform exam?

It depends on how quickly you pick things up, because the AB-400 is a very broad exam. The PL-400 was already big, and this one covers a lot more. If you’re starting out in the Power Platform, Nathalie doesn’t recommend going for it first, the way she did years ago when the PL-400 had a smaller scope. She’d want at least a few months, ideally six months of experience with code apps, plug-ins, model-driven apps and extending.

For the path, she’d start with the fundamentals, then take the AB-410, which is the Intelligent Applications Builder certification, and maybe the AB-620 for Copilot Studio. That gives you more knowledge of AI and agents and how it all works, which helps because the AB-400 has an agent portion.

Nathalie also pointed out that the path used to be easy to follow: fundamentals, associate, expert. With the PL-600 going away, it’s no longer a linear route, and she’s hoping Microsoft makes it a bit more linear again. If you want to see where everything fits today, my Power Platform credentials overview lays it out, and the PL-900 study guide is a good place to start with the fundamentals.

Nathalie’s final tip: don’t underestimate it

Her one piece of advice for the AB-400 exam is not to underestimate it. Open the study guide (opens in a new tab) and go through every objective. If there’s one where you think “I haven’t worked with that yet”, get some experience with it before the exam, because there might be one question on it, or there might be ten.

Nathalie shares a lot of what she figures out at work on her blog (opens in a new tab), and you’ll often find her on the monthly Microsoft Power Platform community call and the weekly calls. If you see her at a user group or an event, say hi.

What this means for you

If you already hold the Power Platform Developer Associate certification, nothing changes for you. You can take the AB-400 to learn what’s new, like Nathalie did, but you don’t have to.

If you’re planning to take the AB-400 exam, plan more hands-on time than you would have for the PL-400. Work through each objective in the study guide, build a code app, connect Visual Studio Code to the Power Platform and an MCP server, and try PCF components with AI. If you’re newer to the Power Platform, start with the fundamentals and the AB-410 before you come back to this one.

And if you’re not a developer, you’re in good company: I’m not going for this one either, especially after this conversation. They’re not Pokémon, and we can’t catch them all.

Ready to start studying for the AB-400? My AB-400 study guide brings together the skills measured and the resources to prepare for the Power Platform Developer Associate certification.