When selecting FBA as the shipper, why doesn't Shipstation show accurate quantities of FBA stock?
It's always showing zero.
Also, when selecting the 3 different shipping speeds, which FBA offers, the shipping cost isn't updated within Shipstation. That bug has existed for months.
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It's possible both of these issues have the same cause.
You should see a rate for your FBA shipments when you select a service type. If you are not seeing a rate it's probably that FBA is not able to identify the SKU sent by ShipStation in the fulfillment request. Are your ShipStation and FBA SKUs different? If so, you must add your FBA SKU to the ShipStation Product records Fulfillment SKU field:
Often you'll see the error "The request must contain the parameter Item.SellerSKU"or"Value XYZ for parameter Items.SellerSKU is invalid. Reason: InvalidValue" when this is the case, but not always.
If the ShipStation and FBA SKU differ and you haven't added that SKU to the Fulfillment SKU field, this is also likely why you are not seeing accurate stock counts in the order details.
From my research so far, there are not any open issues around getting rates with FBA or viewing stock counts, as long as ShipStation is configured correctly.
Check out a few of our help articles on this topic for more info:
Hope this helps!