Users of Elon Musk's X (formerly Twitter) are facing significant issues after a recent mandatory two-factor authentication change. On October 24, the platform announced that anyone using passkeys or hardware security keys, like YubiKeys, needed to re-enroll using the new x.com domain. This shift is part of X's broader plan to phase out the old twitter.com domain, which has been redirecting to x.com since May 2024. However, the problem lies in the fact that these security keys are still linked to the old domain, making it impossible for users to transfer them seamlessly to the new one. As the deadline of November 10 passed, reports flooded in of users being locked out of their accounts. Many can't complete the re-enrollment process due to error messages or getting trapped in loops that prevent access. Those who use authenticator apps are unaffected, but the fallout from this change is significant for those relying on hardware keys. This situation adds to the series of challenges that X has encountered since Musk's acquisition of the platform for $44 billion. The company has seen major layoffs and various controversies under his leadership. Despite these issues, Musk continues to post on the platform without any apparent problems related to the security changes.