IGPAPI
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    Variable LoginTwoFactorAuthenticationAppCodeInputSchemaConst

    LoginTwoFactorAuthenticationAppCodeInputSchema: Struct<
        { ticket: brand<String, "TwoFactorPickerTicket"> },
    > = ...

    What opening the code screen needs: the picker ticket the screen below holds. The step recomputes it from that screen's fresh state, so no ticket travels in the trail; this screen's own QPLs are issued by its answer.