Sellers can alter their tracking details in Shopify and the Marketplace Connect will pick this up and resubmit the fulfilment to Target. It will occur only under the following scenarios:
1. The initial carrier/tracking entered by the seller was submitted to Target and rejected
2. The tracking and/or carrier on the order fulfilment is changed by the seller in Shopify within 30 days.
For further assistance, please reach out to marketplace-connect@shopify.com