You signed in without entering an emailed two-factor code. Two-factor codes are delivered by email, so let's make sure email works before you sign in next time. There are two common causes:
1. Email delivery isn't working
PHP mail() must work for two-factor login codes and digest emails. Confirm your host can send mail, and that the background cron job is running an every-minute entry such as * * * * * php /path/to/cron/dispatch.php.
2. Your account email may be wrong
Codes are sent to . If that address is wrong, correct it from the Users page and try signing in again.