https://techcrunch.com/2019/12/16/amazons-third-party-merchants-are-now-barred-from-using-fedex-ground-for-prime-shipments/

Third-party vendors were told by Amazon over the weekend that they are barred from using FedEx’s ground delivery services for Prime shipments. The Wall Street Journal reports that a message sent by Amazon to merchants on Sunday said the ban will last “until the delivery performance of these ship methods improves.” The e-commerce platform will still allow FedEx Ground for non-Prime shipments and FedEx Express, a faster but pricier option, for Prime.

Third-party sellers now account for more than half the products sold on Amazon.com and the company’s decision on FedEx’s ground delivery comes during the peak of the holiday shopping season. Over the summer, FedEx ended partnerships with Amazon to provide it with express air deliveries and ground shipments.