Quote Originally Posted by MsQi View Post
No not really. If the same computers on the same IP is logging in it's perfectly fine for it to be occasional.
And, when it does need to authenticate, your phone's app checks back with the server when it starts to see if there's a request pending, and if so, just lets you tap a button instead of entering a number. (I assume it transfers the number directly, to prove it's you.) If your phone has no internet connection at the time, then the app can still generate a number to enter.