Goodbye Twitter. com - A hidden deadline every X user needs to know

X Corp is officially retiring the twitter.com domain come November 10, 2025, marking a significant step in the platform's rebranding journey. This change means that users who currently use hardware security keys or passkeys tied to the twitter.com domain for two-factor authentication (2FA) will need to take action to avoid losing access to their accounts. The credentials registered under twitter.com won’t automatically transfer, so users have to re-enroll these keys under the new x.com domain before the deadline. To make sure you don’t get locked out, you’ll need to head over to the X app or website, then navigate to Settings & Privacy → Security and account access → Security → Two-factor authentication. From there, select "Security key" or passkey, delete any existing entries linked to twitter.com, and then add or re-enroll new keys registered under x.com. It’s a pretty straightforward process but crucial for anyone relying on these domain-specific security methods. Thankfully, this transition doesn’t impact folks who use other 2FA methods like authenticator apps or SMS codes, since those don’t depend on the domain name in the same way. This update is purely about the domain switch as part of X’s broader move to unify its platform identity. It’s not a response to any security breach or incident, but a strategic step following Elon Musk’s acquisition and the platform’s renaming in 2023. The move to phase out twitter.com and fully embrace x.com signals the closing of a major chapter in the platform’s history. By migrating authentication and other backend services, X is preparing for a future where the old Twitter branding is completely gone, replaced by a fresh X identity. It’s a big shift that affects not just the look and feel of the site, but also the underlying infrastructure that keeps user accounts secure. If you forget to update your hardware keys or passkeys by November 10, you’ll find your account locked until you either re-enroll under the new domain or switch to another 2FA method. So, it’s definitely worth checking your settings now to avoid any last-minute headaches. This deadline also highlights how domain-specific security credentials can complicate transitions like this, reminding users and platforms alike to stay proactive about security updates during major branding or infrastructure changes.