X has migrated the domain to support security keys and is requesting twitter.com users to re-register.

X platform is advancing a large-scale migration plan for security keys and passkeys, and is requiring users who are already using these authentication methods to take important actions. Due to the discontinuation of the twitter.com domain, users with accounts protected by security keys or passkeys must complete re-registration to x.com within the specified period.

Unification of Authentication Methods from twitter.com to x.com

According to an official announcement from X, since security keys and passkeys are currently linked to the twitter.com domain, users affected by this domain discontinuation process are required to take action. If you are protecting your account with a hardware security key or passkey, you must re-bind these credentials to x.com within two weeks. Failure to re-register will result in the security key becoming invalid and the account being locked, so please be aware.

Actions for Users of Security Keys and Passkeys

This migration is unrelated to any security incidents and is simply a technical response to the unification of domains. X is enhancing security by transferring security keys and passkeys from current account authentication to the new platform system. Users who do not complete re-registration by the deadline will need to either complete re-registration to unlock their account, switch to another two-factor authentication method, or disable two-factor authentication.

Impact on and Response to Other Authentication Methods

As emphasized by X, other two-factor authentication methods such as authenticator applications are not affected by this change. Only security keys and passkeys require re-binding to the x.com domain. The most important thing for users is to ensure they do not overlook re-registration if they own accounts protected by security keys within the deadline.