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Extending copilot agent returns 400 error

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Posted on by AbdullahAhmed_

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I followed this tutorial: https://learn.microsoft.com/en-us/dynamics365/fin-ops-core/dev-itpro/copilot/tutorial-create-ai-plugins with the same code and names.

I disabled generative mood to add phrases to trigger the new tool:

but It always return 400 error!

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AbdullahAhmed_ 418 on at

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Extending copilot agent returns 400 error

It's a sandbox environment linked to my UAT and yes power platform is linked.. exactly like the tutorial.

Data can't be large since the tutorial returns only 3 variables (balance, currency and boolean)

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André Arnaud de Cal... 297,629 Super User 2025 Season 2 on at

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Extending copilot agent returns 400 error

Hi Ahmed,

What environment type are you using? A CHE where a Power Platform environment is linked, a Tier2 sandbox or an UDE environment?

After building the code, have you also performed a full database synchronization? That task should register the plugins for Copilot Studio.

A 400 error can also mean that returned data from the X++ plugin is too large. See also: Troubleshoot connector request failure - Microsoft Copilot Studio | Microsoft Learn

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AbdullahAhmed_ 418 on at

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Extending copilot agent returns 400 error

Try what?

I already tried another example and It doesn't work! I don't know why!

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CU11090914-0 2 on at

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Extending copilot agent returns 400 error

I encountered an error doing what you asked. Could you try again?

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