If you are not a Blue member, you will soon have to utilise an authenticator app or a security key to use two-factor authentication on Twitter. Text-based 2FA is now available only to subscribers who pay for the website’s membership service. Non-Twitter Blue members can no longer activate it, but those who have already used it have until March 20th to deactivate it and use another sort of authentication. If they do not switch by that date, Twitter will simply deactivate their 2FA.
