I have installed the Android app and when I try to sign in using Google using two-factor authentication it fails. The process goes like this:
1. Type my help desk address and hit the G+ button.
2. Type my Gmail address and password.
3. Type my two-factor authentication code.
At this point it thinks for a bit and then displays the two-factor dialog again. Only now, the Verify button no longer works. This happens on both my tablet and phone.