yeah, same here. all i'm getting is a "new login request" notification on the phone when trying to login on the desktop browser. but when opening the notification it says "no new login requests", and the website on the desktop jumps to "We're sorry, there were was an error. Please try logging in again.".
Now when I try and log in, it says it has sent a login request to my phone, my phone registers that as a notification, but when the Twitter app opens it says I have no login requests - so still not working.