$ h 2fa --help
Alias: 2fa redirects to twofactor
Usage: heroku 2fa
Display whether two-factor is enabled or not
Additional commands, type "heroku help COMMAND" for more details:
2fa:enable # Enable 2fa on your account
2fa:enable # Disable 2fa on your account
2fa:generate-recovery-codes # Generates (and replaces) recovery codes