Duo is Google’s video calling solution ... all the usual mobile and computer platforms, and video calling via its Windows app ...

When using the Duo Mobile app I get a message, "We have detected some security issues with your device that require your attention." What should I do? The Duo app helps keep you safe by suggesting you ...

Once you have the Duo app installed on your smartphone, you may verify your login through a number of options. Duo will use whichever authentication method you used last by default.