L'utilisateur ne peut pas se connecter avec l'authentification à 2 facteurs. Indique "chaque code ne peut être utilisé qu'une seule fois"

Soutien
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The user was connected with 2-factor auth before. Suddenly he was denied login (after connecting from another device). Trying to solve this i as admin deleted his old account (it was new, no replies yet so we didn’t mind), but the problem repeats when he tried to create a new account:

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the user deleted the account from his google authenticator app, and re-scanned the new QR code. that didn’t help.
what “code” is being used again?

Discourse version: 9da9b2e1

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Looking for clues for this error message:

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C’est arrivé aussi quand je créais un nouveau compte sur le forum Unix Linux Community. Je pense que la double authentification y est buggée et non supportée.