title: AWS CodeBuild Download Source failed message authentication
body: <p>Has anyone come across this failure message for AWS CodeBuild on the DOWNLOAD_SOURCE step that could provide some insight into how to resolve this error?</p>
  
  <p><code>Message authentication required for primary source and source version</code></p>
  
  <p><a href="https://i.stack.imgur.com/X0b7s.png" rel="noreferrer"><img src="https://i.stack.imgur.com/X0b7s.png" alt="AWS CodeBuild failed"></a></p>