OK, I did read that... So what you're saying is it wasn't "failing" and returning an error for incorrect pin, it was just not progressing to the next step, correct? If so, then you weren't at any risk of it shutting you out, and that would be my misinterpretation of the events. Still, I do want other members to know that if it DOES return an error for incorrect pin, you should be very careful not to do that too many times (is it 5 failures, I think???), otherwise it will lock you out. Then It either waits 30 seconds and then allows you to try again, or goes the Google authentication way.
As for the voice pin, haven't tried it so I can't give you any feedback at this point. I may be able to give it a run tonight and report back tomorrow.