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Developer fixes silent 401 errors in OneNote MCP Server by tackling Microsoft Graph auth scopes

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Developer Amandeep Singh built and rewrote a OneNote MCP server in TypeScript to enable AI assistant Claude to read OneNote notebooks. During the process, he encountered persistent silent 401 authentication errors on every API call. The root cause was traced to Microsoft Graph API authentication scope issues and problems with silent token renewal. Singh documented the full debugging journey in a technical write-up published on DEV Community on July 19. The article serves as a practical tutorial for developers working with MCP servers and Microsoft Graph authentication.

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Developer fixes silent 401 errors in OneNote MCP Server by tackling Microsoft Graph auth scopes · ShortSingh