I am looking to trade futures and options on futures combos. Example: long ESZ12, Short ESH13, Long ESZ12 1400 PUT, Short ESH13 1400 Call. At my current broker, IB, these gets priced in TWS and I am able to get margin. However, when I place the order TWS gives an error "Combo not supported". IB's support asked me to break these orders, as I can only place FUT OR FOP, not combo for FUT/FOP, but required margin on broken order is 5x of the combo. Can anyone suggest a broker who let me trade these combos? Thanks in advance.