TShirtgang order not auto fulfilling after customer purchase. Settings set to autofill in Shopify

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When a customer places an order for a tshirt from my shopify store, the order shows fulfilled in Shopify, however does not auto fulfill to TShirtgang unless I manually select the option to fulfill it myself.  My settings in Shopify is set to autofulfill when order is placed....I assume thats the reason why the order showed fulfilled in Shopify.  

I'm looking to have my store fully automated so that my orders autofulfill to TShirt gang, without me manually doing it myself.  How do I go about doing that?