In a statement following the decision, the USSF said it expected the USWNT to proceed with the appeal but that it is hopeful for an out of court resolution.
"U.S. Soccer is 100% committed to equal pay. We have offered the USWNT the identical compensation provided to our men's players for all matches controlled by U.S. Soccer.
"Unfortunately, the USWNT has not accepted our offer or our long-standing invitation to meet to try to find a resolution unless U.S. Soccer first agrees to make up the difference between the Men's and Women's World Cup prize money, which is determined, controlled and paid for by FIFA.
"Our request to meet still stands, and we hope the USWNT will accept our invitation very soon. We look forward to working together to chart a positive path to grow the game both here at home and around the world."