If you run into this error when trying to login to https://discuss.circleci.com you can resolve it by going to the user settings page and send a password reset email to yourself. This will provide a link so that you can configure a password to use in the future.
As part of CircleCI's SOC 2 compliance efforts and continuously bolstering our security practices more generally, we have adopted wider implementation of two-factor authentication (2FA) across many of our applications and systems, including our community forum.
Our goal is to provide our users the benefit of the additional layer of security offered by 2FA and decreasing the probability that an attacker can impersonate a user and gain access to accounts or other sensitive resources. 2FA also provides a safe and secure way for our users and customers to reset their own passwords if/when needed.