Issue
What is MFA and how does it work?
Resolution
MFA adds another layer of security to your login process by requiring users to enter two or more pieces of evidence, or factors, to prove they're who they say they are.
By tying user access to multiple, different types of authentication factors, it's much harder for a bad actor to access your Heroku environment. For example, even if a user's password is stolen, the odds are very low that an attacker will also be able to guess or hack a code from the user's authentication app.
To learn more, visit the Multi-factor Authentication article on Dev Center.