It's called a challenge, technically speaking. Any time you're stopped and asked to prove who you are, that's a challenge, like how a security guard might stop and challenge you trying to walk into um, The Cannes Film Festival.
Zipwire's not quite as salubrious but nevertheless, once you've setup two factor authentication, we'll stop you now and again to make sure it's still actually you.
In your account settings you'll see the two factor setup UI.
You set it up by scanning the QR code in your account settings using your favourite authenticator app.
The app will ping or buzz when it's read the QR code and begin showing a 6-digit code for 30 seconds, before generating another code. You must enter the code on display so we know you know that we know it's all working.
The UI will change to let you disable it, in case you lose your phone or something. You cannot disable it unless you're logged-in and have access to your email.
{% hint style="info" %}
You will not need your two factor code to simply login and move around, but certain parts of the app and some actions are beyond the red rope, as it were.
{% endhint %}
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