Authentication process in Reddit Example fails as the QOAuth2AuthorizationCodeFlow status never changes from TemporaryCredentialsReceived to Granted

Authentication process in 'Reddit Example' fails as the QOAuth2AuthorizationCodeFlow status never changes from TemporaryCredentialsReceived to Granted.

Steps to reproduce:

• set up the Reddit Example so that it is ready to run ( https://doc.qt.io/qt-5.10/qtnetworkauth-redditclient-example.html )
• create reddit account
• register the app here: https://www.reddit.com/prefs/apps/
  • redirect uri: http://localhost:1337/
• copy the client_id from reddit (app page)
• run Qt's Reddit Example with the client_id as an argument
• observe the status changes of 'oauth2' found in file 'redditwrapper.cpp'
  EXPECTED: the status changes eventually to 'QAbstractOAuth::Granted'
  ACTUAL: The status never moves beyond 'QAbstractOAuth::TemporaryCredentialsReceived'