SFN: "Barcode is already in use, enter another barcode."

We are moving our fulfillment from FBA (Fulfillment by Amazon) to SFN (Shopify Fulfillment Network).

I am on **Step 2 -**Barcode products of Create inbound transfer. I have trying to use the barcode that I already have on my listing, but I am getting this error: Barcode is already in use, enter another barcode.

I should be able to use the barcode (UPS) that is on the product listing.

Update: I had to reach out to customer service and the SFN team was able to resolve the issue. I don’t know what the problem or the solution was, but it was on Shopify’s side.