On August 7, 2022, Reid-Brown made his senior debut when he came on as a 81st-minute substitute for Andrew Forth in a 3–0 loss to Toronto FC II.
[3] On April 16, 2023, Reid-Brown made his first senior start in a 3–1 loss against Atlanta United 2 in which he was taken off in the 57th-minute for Ian Garrett.
[5][6] On October 20, 2024, Reid-Brown made his first playoffs appearance when he came on as a substitute for Luca Petrasso against Chicago Fire II in the 77th-minute.
[9] On October 25, 2023, it was announced that Reid-Brown was selected by United States U17 coach Gonzalo Segares to the 21-player squad for the 2023 FIFA U-17 World Cup.
[13] On October 15, Reid-Brown made his first start for the soccer team against Japan, before he was substituted in the 62nd-minute for Paulo Rudisill in a 3–2 victory.