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claude-code - 💡(How to fix) Fix [BUG] Authentication token header is failing again for AWS Bedrock [1 participants]

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anthropics/claude-code#54083•Fetched 2026-04-28 06:39:40
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Error Message

Error Messages/Logs

Code Example

403 {"Message":"Authentication failed: Please make sure your API Key is valid."}
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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

I am currently using Claude Code v2.1.119 via AWS Bedrock, and when I try to send a prompt, it enters into the retry loop. All I am doing is sending a simple "hello" prompt to it.

What Should Happen?

Get a response back.

Error Messages/Logs

403 {"Message":"Authentication failed: Please make sure your API Key is valid."}

Steps to Reproduce

Run Claude Code via AWS Bedrock, set up your environment variables, on a Ubuntu 24.04 machine, start it up with claude, and then feed it a hello prompt.

Claude Model

Other

Is this a regression?

Yes, this worked in a previous version

Last Working Version

v2.1.117

Claude Code Version

v2.1.119

Platform

AWS Bedrock

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

I remember this being a issue about a week or two back, where they mentioned that updating a aws sdk dependency bricked the Bedrock auth, which I am assuming one of the agents likely did again...

extent analysis

TL;DR

The issue is likely caused by an invalid API key due to a broken AWS SDK dependency, and updating the dependency or reverting to a previous working version may resolve the issue.

Guidance

  • Verify that the API key is valid and properly configured in the environment variables.
  • Check the AWS SDK dependency version and consider updating or reverting to a previous version that worked with Claude Code v2.1.117.
  • Review the authentication flow in Claude Code to ensure it is correctly handling the API key and AWS SDK dependency.
  • Investigate the previous issue mentioned in the additional information to see if it is related to the current problem.

Example

No code snippet is provided as it is not explicitly mentioned in the issue.

Notes

The issue may be specific to the AWS Bedrock platform and Ubuntu 24.04 machine, so the solution may not apply to other environments.

Recommendation

Apply workaround: Revert to Claude Code v2.1.117, which was the last working version, until the issue with the AWS SDK dependency is resolved.

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#api#environment variable#task chaining#parallel task#integration issue

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claude-code - 💡(How to fix) Fix [BUG] Authentication token header is failing again for AWS Bedrock [1 participants]