Send warnings when someone logs into your account with 2FA - Website Features - Developer Forum

NoHacked: Using two-factor authentication to protect your site, Google Search Central Blog

Instagram to block adults sending messages to children

Solved: Unknown people logging in - The Spotify Community

Nextcloud features that put you in control

Getting Started with Two-Factor Authentication Using ASP.NET Core, AngularJS, and Twilio Authy

Safe by Design: An Overview of UX Security

USL - Uber's Unified Signup and Login Stack

Beware rogue 2FA apps in App Store and Google Play – don't get hacked! – Sophos News

Enabling and disabling two-factor authentication

Tips for keeping your X account secure

When someone's logs into your iCloud account, does Apple contact you? - Quora

WP 2FA – Two-factor authentication for WordPress – WordPress plugin

Account management - Balena Documentation

Apple sued because two-factor authentication… oh, I give up • Graham Cluley