Can anyone help me build a multi city itinerary that works?!?! I have tried numerous different ways but continue to get errors. I have verified flight availability by checking one ways for each segment but can't get multi to work. I have read there are certain restrictions about segment length and open jaw but I have no idea what that means

Trying to go from ORD-MCT-AMM-LCA-ORD. We can eliminate a city if need be but just trying to find an itinerary that works and get to see a few different places in the middle east. Dates flexible (as are cities if there is a better itinerary that doesn't violate the multi city booking restriction). Do not want to buy one ways b/c want to use my healthcare promo code.

Thanks in advance for any help!