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The connector 'OneNote (Business)' returned an HTTP error with code 400.

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Posted on by NH-03021501-0 Microsoft Employee

I'm having this error:

Error Message: The connector 'OneNote (Business)' returned an HTTP error with code 400.

Inner Error: Notebook Key 'Breakdown%7C%24%7Chttps%3A%2F%2Fmicrosofteur.sharepoint.com%2Fteams%2Fasmeil%2FShared%20Documents%2FVideo%20Indexer%2FBreakdown' is not valid

Error Code: ConnectorRequestFailure

Conversation Id: add2ae16-70dd-4d69-bc1a-feb1651cdca3 Time (UTC): 2026-02-03T15:02:07.441Z

any idea how to resolve?

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Autonomous agents

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André Arnaud de Cal... 657 on at

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Hi,

Can you tell us what you have done and how your Copilot Agent is configured for the OneNote connector? What steps to perform to reproduce your error?

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NH-03021501-0 Microsoft Employee on at

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I am building an agent whose first step is to read a OneNote page.

screenshots attached

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Bret Fraser Community Manager on at

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Tagging @André Arnaud de Calavon to notify that there was a follow up to a question.

thanks!

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André Arnaud de Cal... 657 on at

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Hi,

I just tried to reproduce you issue. For my user, I have two notebooks. One is working correctly, the other gives the same error message as you have.
So far, I have not identified any difference that leads to the root cause.

Do you have other notebooks available for testing?

In the meantime, I will try to find out what might be the issue. You can also raise a ticket for Microsoft Support as the error message is unclear.

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