Google Authenticator on Android, Invalid PIN

2FA is pretty cool, especially when you don’t have to get a text message or email. Google Authenticator generates codes that expire after 30 seconds, so I figured it’s a good option for 2FA. I tried installing it on my Samsung Android and it said it was installing for over 24 hours. Finally I gave in and connected to wifi at which point it installed in a minute or less.

Next issue was invalid PIN. No matter what I tried my PIN was invalid! Then a colleague suggested it’s because my phone’s time is off by a few minutes. Under Settings – System – Date and time – I found that “Automatic date and time” was unchecked. After checking that, my time updated and my Authenticator codes worked right away!

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