Used to work great with all of my prior Android phones. Recently got a Moto e on ATT Go and could not get it to work via either barcode scanning or manual code entries. Tried disabling automatic network time and syncing time in the Authenticator app to no avail. Turned out that despite both devices showing the same time and being on the same WiFi network  I had to do a manual key entry in my PHONE's browser and not from my PC  and it worked (on Chrome for Android). The fact that I needed to take this many steps is ridiculous.
February 04 2016