I've set everything up as requested, all the Twitter App credentials are fine.
The 'Sign in with Twitter' button shows as expected and when clicked, the Twitter authorize page shows. After entering details (for another one of my Twitter accounts) the app authorizes successfully and sends me back to the page on my website.
However, then nothing happens – the 'Sign in with Twitter' button is still there and I cannot comment. If I click the sign in button again, it seems to change the url to a Twitter auth session a few times without leaving the page (presumably as you've already authorized the app) still cannot comment.
Seems to be an issue with the STC code not recognising that the user is authorized?
In the WordPress admin, under 'Discussion' I've got the 'Comment author must fill out name and e-mail ' unchecked as I read somewhere this wouldn't work without doing so.
Can any help me get this sorted, or is it a known issue? I'd love to get this working.