@cfxlabsinc/b2b-services
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    Variable ChallengeStepConst

    ChallengeStep: React.FC<
        PropsWithChildren<
            {
                email: string
                | null;
                restart: SignInFormHandler;
                supportEmail: string | undefined;
            },
        >,
    > = ...

    A step Cognito asks before there is a session, with the way back to the email step: /signout ends a session, not the sign-in cookie, so it would land here again.