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Variation error: Merchant sku is unknown

When you submit variations to JET you need to make sure you first submit children then a parent otherwise you will see an error stating Variation error: Merchant SKU XXX is unknown, where XXX are SKUs that are linked to the Parent.

Please note that after you submit successfully children, you may need to wait about 15 minutes to give some time for JET to process products before you submit Parents.

This is okay to submit products in bulk and see those errors, it just means you need to resubmit parents again after sometime when JET will have the children SKU's in their database.