Hey, there. I can positively perceive your frustration. On the present time, the Amazon channel cannot create or sync with Amazon listings that use FBA. It’s because Amazon has particular necessities on how achievement for FBA orders ought to work, and orders imported into Shopify could also be vulnerable to being fulfilled by accident (on account of computerized achievement or different customized setups).
In an effort to forestall orders being fulfilled twice or breaking the phrases of FBA, we can not import FBA orders into Shopify. Hope that gives some context there, however be happy to contact help in case you have any additional questions. Cheers. – Brie, Shopify Help