Iskra API Reference
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    Type Alias AuthFailure

    AuthFailure:
        | "empty_password"
        | "user_not_found"
        | "ambiguous_user"
        | "invalid_credentials"
        | "account_disabled"
        | "account_locked"
        | "account_expired"
        | "password_expired"
        | "password_must_change"
        | "logon_not_permitted"

    Why a login failed, for logs and metrics. Never tell the client which one: it tells an attacker which accounts exist.