On August 8, Cosmos B capped the undefeated season by defeating Chattanooga FC 3-2 at Finley Stadium to win the NPSL national championship.

[4] Following the successful season, then-Cosmos Chief Operating Officer Erik Stover stated that while the team was eligible for the U.S. Open Cup, since a new tournament rule at the time only barred professional teams that were majority owned by a higher-level professional league teams from taking part in the competition and not amateur ones, it would not take part and explained that "the integrity of the tournament is more important.

[11] With no first team, the group began seeking a berth into the 2018 Lamar Hunt U.S. Open Cup but was originally not permitted to compete in the competition.

This was due to the fact that the B hadn't finished the 2017 season in a high enough position to be allocated a spot while the first team had neither a professional league to play in and had been league-less at the deadline set by U.S. Soccer.

[13] On December 13, 2019, the New York Cosmos announced that the team had been admitted into the National Independent Soccer Association for the Fall 2020 season.