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The Cognito war stories: four ways it breaks an MCP server, and the fix for each

If you are putting Amazon Cognito behind a remote MCP server, here are four specific ways it will break the connector before you ever reach your own code - each with the symptom, the reason, and the…

  • Cognito rejects RFC 8707 resource indicators, breaking MCP server authentication
  • Cognito access tokens lack aud claim, complicating audience validation
  • Managed Login v2 requires client branding styles, causing login page unavailability

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