Same problem for me, i cannot buy any game because this error show me up:
An error occurred. Please try again later. [ref. #Error: httpRequest ERROR: https://gateway.ea.com/proxy/commerce/carts2/store-cart-purchase-client/offerEntries?storeId=origin-... 409 (Conflict)]
Pleas, help me...
Just as confusing as all the rest trying to explain this. Maybe screenshots step by step, cuz i have tried this crap 1000 times by now, and there is no location selection anywhere in origin app or web.