After a minor security scare, I want to improve security for both my kids by walking them through setting up 2FA for all their important accounts - their Microsoft ID (aka Live ID), Google, Facebook, etc.
I've got this set up myself - when I log onto my Google account, it prompts me to enter a six digit number generated by Microsoft Authenticator on my phone, so I know this works and is currently supported by Google.
When I set this up on my phone (Lumia 950XL) in March 2016, the Google security page generated a QR code that I scanned using the Microsoft Authenticator app, and everything "just worked".
Trying to set this up for my daughter tonight, I can't find the option in her Google settings to generate a QR code. Instead, 2FA seems to now revolve entirely around apps that Google publishes for Android and iOS, not much help for her Lumia 640.
How do we set up 2FA for her Google account without an Android or iOS phone?