Please don't post the same question across multiple threads. It only leads to repeated/duplicate answers. I have moved your posts onto your own thread. If somebody can help they will answer your question here.
I had the same problem.
To fix it, I stopped the app on my iPhone - that is, I double-pressed the Home button, then swiped the app up to close it. I then returned to the app and tried and again, and it connected successfully.