Why Does the AWX Command Line Interface not Respond with the Authentication Error Even If the Username and Password are Correct?

Issue

• Why does the AWX command line interface not respond with the authentication error even if the username and password are correct?

  The following command returns a valid token without issue,

  $ awx -k -f human --conf.host https://Tower --conf.username admin --conf.password password_for_admin_user login
  export TOWER_OAUTH_TOKEN=XXXXXXXXXXXXXXXXXXXXXXXX
  

  But the following one fails with "Valid credentials were not provided." even if I use the same username and password.

  $ awx -k -f human --conf.host https://Tower --conf.username admin --conf.password password_for_admin_user projects list 
  usage: awx [--help] [--version] [--conf.host https://example.awx.org]
             [--conf.token TEXT] [--conf.username TEXT] [--conf.password TEXT]
             [-k] [-f {json,yaml,jq,human}] [--filter TEXT]
             [--conf.color BOOLEAN] [-v]
             resource ...
  
  …
  Valid credentials were not provided.
  $ awx login --help