Send warnings when someone logs into your account with 2FA

How to Successfully Introduce Two-Factor Authentication To Your Team - Stanfield IT

Setting up two-factor authentication

Use Two-factor Authentication to Protect Your Accounts

So Hey You Should Stop Using Texts for Two-Factor Authentication

Enabling and disabling two-factor authentication

Gmail will lock important settings behind a pop-up 2FA challenge

Facebook is blocking me in 5 different ways from logging into my account - text message, Code Generator, login alerts, 2FA settings, identity confirmation (screenshots with comparison to a normal account) : r/facebook

Use Two-factor Authentication to Protect Your Accounts

SMS or Email for Two-Factor Authentication?

If my account is locked, how can I regain access? - My Account

Google Warns Gmail Users Ahead Of New Security Alerts—Set Up 2FA Now

Two-Factor Authentication: Set Up, Removal & Token Generation – Discogs

How to Set up Two-Factor Authentication on Facebook

Facebook Adds FIDO U2F Security Keys Feature For Secure Logins

Enforce Two-Factor Authentication (2FA) for all users (Admin only) - Gorgias