Conferring with my colleague, based on your original screenshot, you upgraded to the version 2 Twitter login API at some point. I'm afraid, our current login code will not work with that. It is on our to-do list to upgrade our login code to be functional with the new Twitter version.
If you still have your Twitter version 1 API keys, it will work. However, if you did perform an upgrade, it will no longer work due to being on version 2. I am sorry for any confusion.