Langchain Chat Error

Standard chat request in the browser

What happens?

Chat requests result in a LangChain chat error.

App / Component: Copilot Browser Chat

Device / Environment: Local PC

Operating System / Office Version: Win 11 / Chrome

Selected Model: Claude Sonnet 4.6 – US

Steps to reproduce:

Presumably, submit a similar chat request.

Expected result: Processing of the request and a PDF document.