An Amazon S3 authorization error will look something like this:
Authorization error

  • Make sure you have inputted the correct Access Key ID (not root Access key) and the Secret Access Key:
  • Access Key and Secret Access Key

  • If you have typed-in the correct Access Key ID and Secret Key ID but still get the error, check if your user name has a AmazonS3FullAccess policy.
  • Full Access Policy

For reference, Amazon AWS’s security best practices are described here:
Amazon AWS Security best practices.