On April 17, 2019, it was announced by WWE that Scott had been one of three newest signees to WWE NXT and was starting at the WWE Performance Center alongside Kushida and Angel Garza. He wrestled his debut match against Cameron Grimes, a dark match that took place before the May 1 NXT television tapings. In June, it was announced that Scott would compete in a tournament named the NXT Breakout Tournament, where he made his debut on the July 3 episode of NXT, losing to Cameron Grimes in the first round of the tournament. On July 23, he debuted on 205 Live in the main event, wrestling WWE Cruiserweight Champion Drew Gulak, in a match that Scott lost. He subsequently returned to 205 Live the following month to compete on Oney Lorcan's team in a ten–man tag team match where Lorcan's team was victorious. Scott would continue wrestling on 205 Live and NXT as he challenged for the Cruiserweight Title at Worlds Collide in a Fatal Four-Way match against Travis Banks, Jordan Devlin and then-champion Angel Garza but was unsuccessful. On April 12, 2020, Scott was announced as a participant in the Interim Cruiserweight Title tournament representing Group B in the tournament. He was defeated by Akira Tozawa and Jack Gallagher, but was able to defeat El Hijo del Fantasma, leaving him with one win in the tournament thus failing to advance to the finals. Scott then began feuding with Santos Escobar (the former El Hijo del Fantasma who had won the Cruiserweight Title tournament), after Scott claimed to be the only one who has pinned Escobar in NXT. On the August 26 episode of NXT, Scott challenged Escobar for the Cruiserweight Title, but lost after Escobar hit him with a loaded mask. On the September 1 episode of NXT Super Tuesday, Scott and Breezango (Tyler Breeze and Fandango) defeated Legado del Fantasma in a six-man street fight after Scott once again pinned Escobar, thus earning Scott a title shot at NXT TakeOver: 31, which he would go on to lose.
Scott then entered the Dusty Rhodes Tag Team Classic tournament, where he was paired with Jake Atlas, but the two were eliminated from the tournament by the eventual winners MSK (Nash Carter and Wes Lee) and following the match, argued with one another. On the February 17, 2021 episode of NXT, Scott attacked Leon Ruff after losing a match to him, turning heel. At NXT TakeOver: Stand and Deliver, Scott would participated in a six-way match, where he eliminated Ruff and Cameron Grimes but would be last person eliminated in the match by Bronson Reed. On the May 4 episode of NXT, Scott defeated Ruff in a Falls Count Anywhere match after Top Dolla interfered on Scott's behalf. After the match, Scott and Dolla would be joined by Ashante "Thee" Adonis and B-FAB, forming the stable Hit Row Records. On the June 29 episode of NXT, Scott defeated Bronson Reed to win the NXT North American Championship. Scott then feuded with Santos Escobar for the NXT North American Championship, losing a six-man tag team match alongside Top Dolla and Ashante Adonis, losing to Santos Escobar, Raul Mendoza, and Joaquin Wilde.
On October 1, during the 2021 WWE Draft, Scott, along with the rest of Hit Row, were drafted to the SmackDown brand. On the October 12 NXT, he defeated Santos Escobar to retain his NXT North American Championship, only to lose it immediately afterwards to Carmelo Hayes, ending his 105-day reign. On November 4, B-Fab was released from her WWE contract, shortening the group. On November 18, Scott was released from his WWE contract along with Adonis and Dolla.