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General

AWS did not recognize the client credentials in the request

UnrecognizedClientException

AWS rejected the request because the access key, certificate, or security credentials in the request do not exist in its records or are not valid for the call.

UnrecognizedClientExceptionauthentication

Observed message

UnrecognizedClientException

Why it happens

  • The access key ID or certificate is invalid or no longer exists.
  • The request is using the wrong account or stale credentials.
  • Temporary credentials are incomplete or malformed.

How to fix it

  1. Verify the access key, secret key, or session credentials being used.
  2. Confirm the request is targeting the intended AWS account and environment.
  3. Regenerate or refresh credentials if the current values are stale or incorrect.

Official reference

AWS Management Console: Common Errors

Related errors

AccessDeniedExceptionAWS API request failed with AccessDeniedExceptionNotAuthorizedAWS request failed with NotAuthorizedMissingAuthenticationTokenAWS request is missing an authentication tokenIncompleteSignatureAWS request signature does not conform to standards

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AWS UnrecognizedClientException: causes and fixes | Error Atlas