I have followed the instruction and double checked and even did the whole process a 2nd time. When I try to post my new blog post to Twitter I get the following error :This account is not authorized to post to Twitter.
When I hit the Submit Test Post to Twitter it works and I see the test on my Twitter account.
Can’t offer a proper solution but when logged into a different facebook account to the one I set the plugin up with. I get that error message. I then go back to the one I was logged into when I set the plugin up and it works fine. Only after I have authorised it can I then move to another account. It might be the same if you have more then one twitter account?.