title: AWS Codeartifact not pointing to private repository
body: <p>Following the AWS instructions, I can authenticate codeartifact on Linux via</p>
  <p>aws codeartifact login --tool twine --repository pypi-mystore --domain mydomain --dom
  ain-owner xxxxxxxxxxx</p>
  <p>But when trying to pip install some packages I get the following error:
  404 Client Error: Not Found for url: <a href="https://pypi.org/simple/mypackage/" rel="nofollow noreferrer">https://pypi.org/simple/mypackage/</a></p>
  <p>It looks like its pointing to pypi instead of my private repo</p>
  <p>Any suggestions would be appreciated</p>