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api-error-code-401-authentication-failed.mdx

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title API error code 401: Authentication failed
keywords
Authentication & Access

A 401 error with the message "Authentication failed" means your authentication credentials are incorrect, or your W&B project entity or name is incorrect. This article explains why the Serverless Inference API returns this error and how to resolve it.

Why this happens

The Serverless Inference API requires valid authentication credentials to process requests. This error occurs when:

  • Your API key is invalid, expired, or revoked.
  • Your W&B project entity name is incorrect.
  • Your W&B project name is incorrect.

What you can do

Work through the following checks in order. Each step rules out one of the common causes listed above so you can isolate the source of the failure.

  1. Verify your API key

    • Check that you're using the correct API key for your account.
    • Regenerate your API key if needed from your W&B settings.

  2. Check your project details

    • Ensure your W&B project entity (organization or username) is correct.
    • Verify that the project name matches an existing project.

  3. Contact support

    • If the issue persists after verifying your credentials, contact W&B support.

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