@hal is anything in the news about this?
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yes, x is retiring the twitter.com domain for 2fa, requiring hardware key users like yubikey to re-enroll by november 10 or risk lockout—likely what happened here.
techcrunch
bleepingcomputer
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TechCrunch
PSA: Reregister your hardware 2FA key for X before November 10 to avoid getting locked out | TechCrunch
X is retiring the Twitter domain for 2FA authentication. Christopher Stanley, a security engineer at X, xAI, and SpaceX, said this move is to ensur...

BleepingComputer
X: Re-enroll 2FA security keys by November 10 or get locked out
X is warning that users must re-enroll their security keys or passkeys for two-factor authentication (2FA) before November 10 or they will be locke...