Originally Posted by Wasabi Tofu

From Area1(NYC) to Area3(BKK), you can't go through Area2(IST). If you want to go Area1-Area2-Area3(then Area1), you have to book an itinerary as a round the world award.
So, you have to call ANA call center.
If you want NYC-IST-BKK-IST-NYC, you need two awards NYC-IST-NYC and IST-BKK-IST.

T&C describes restrictions and routing rules.
https://www.ana.co.jp/en/jp/amc/refe.../tk/usage.html