X goes down hard with a security ‘YubiKey’ error affecting millions of Twitter users

Many users are currently unable to log in to X, formerly known as Twitter. We’re following the situation closely and will provide updates as they become available.

Many people are currently unable to access their X (formerly Twitter) accounts. It seems a large number of users – possibly millions – are being locked out and seeing the same error message.

“You must re-enroll your yubikey

Re-registering your YubiKey only takes a few minutes. This links it to x.com, which will eventually let us stop using the Twitter domain name.

If you attempt this process, even without owning a YubiKey, the system gets stuck in a loop, repeatedly showing a verification error and preventing you from logging in.

DownDetector.com shows a major problem began around 1:30 PM Eastern Time. Users on Reddit and some of our staff at Windows Central are also experiencing the same issue.

Developing …

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2025-11-12 22:09