On June 25, 2019, Nox made her in-ring return at an NXT live event in Orlando, Florida.
On September 11, Nox made her NXT UK debut when she defeated Shax.
Afterwards, Nox began a feud with NXT UK Women's Champion Kay Lee Ray, resulting in a championship match between the two on the October 2 episode of NXT UK, where Nox was unsuccessful.
On October 16, Nox returned to NXT, defeating Taynara.
Thereafter, Nox began teaming with long-time friend Dakota Kai, with the two defeating Jessamyn Duke and Marina Shafir to become number one contenders to the WWE Women's Tag Team Championship on the October 23 episode of NXT.
 Nox and Kai would go on to lose their title match against The Kabuki Warriors (Asuka and Kairi Sane) on the October 30 episode of NXT.
Two days later on SmackDown, Nox and Ripley were one of the many NXT wrestlers to invade the show, challenging Mandy Rose and Sonya Deville to a tag-team match, which Nox and Ripley emerged victorious.
Later that night, Nox joined Triple H and the rest of the NXT roster as they declared war on both Raw and SmackDown, and vowed to win the Survivor Series brand warfare.
Nox was chosen by Ripley to join her team as part of a women's WarGames match at NXT TakeOver: WarGames.
At the event on November 23, just before the match took place, Mia Yim was attacked backstage and unable to compete in the women's WarGames match, before her teammate Dakota Kai replaced Yim on Team Ripley.
Ripley's team defeated Shayna Baszler's team, however Nox would not take part in the match after Kai turned on Team Ripley and attacked her.
After a short hiatus due to a storyline injury, Nox returned on the January 15, 2020 episode of NXT, competing in a number one contendership battle royal for the NXT Women's Championship, where she was unsuccessful after Kai interfered and eliminated her.
On the January 29 episode of NXT, Nox defeated Kai after using a knee brace following interference by Candice LeRae.
On February 16 at NXT TakeOver: Portland, Nox lost to Kai in a street fight match after interference by the debuting Raquel González, formerly known as Reina González.
On the March 4 episode of NXT, Nox lost to Kai again in a steel cage match, after González interfered.
On June 7 at NXT TakeOver: In Your House, Nox teamed up with Mia Yim and Shotzi Blackheart to defeat Kai, González and Candice LeRae in a six-woman tag team match.
On the July 1 episode of NXT The Great American Bash, Nox defeated Kai, LeRae and Yim in a fatal four-way elimination match to become the number one contender for the NXT Women's Championship.
On the July 15 episode of NXT, Nox was unsuccessful in her title match against defending champion Io Shirai.
On June 25, 2019, Nox made her in-ring return at an NXT live event in Orlando, Florida. On September 11, Nox made her NXT UK debut when she defeated Shax. Afterwards, Nox began a feud with NXT UK Women's Champion Kay Lee Ray, resulting in a championship match between the two on the October 2 episode of NXT UK, where Nox was unsuccessful. On October 16, Nox returned to NXT, defeating Taynara. Thereafter, Nox began teaming with long-time friend Dakota Kai, with the two defeating Jessamyn Duke and Marina Shafir to become number one contenders to the WWE Women's Tag Team Championship on the October 23 episode of NXT.  Nox and Kai would go on to lose their title match against The Kabuki Warriors (Asuka and Kairi Sane) on the October 30 episode of NXT. Two days later on SmackDown, Nox and Ripley were one of the many NXT wrestlers to invade the show, challenging Mandy Rose and Sonya Deville to a tag-team match, which Nox and Ripley emerged victorious. Later that night, Nox joined Triple H and the rest of the NXT roster as they declared war on both Raw and SmackDown, and vowed to win the Survivor Series brand warfare. Nox was chosen by Ripley to join her team as part of a women's WarGames match at NXT TakeOver: WarGames. At the event on November 23, just before the match took place, Mia Yim was attacked backstage and unable to compete in the women's WarGames match, before her teammate Dakota Kai replaced Yim on Team Ripley. Ripley's team defeated Shayna Baszler's team, however Nox would not take part in the match after Kai turned on Team Ripley and attacked her. After a short hiatus due to a storyline injury, Nox returned on the January 15, 2020 episode of NXT, competing in a number one contendership battle royal for the NXT Women's Championship, where she was unsuccessful after Kai interfered and eliminated her. On the January 29 episode of NXT, Nox defeated Kai after using a knee brace following interference by Candice LeRae. On February 16 at NXT TakeOver: Portland, Nox lost to Kai in a street fight match after interference by the debuting Raquel González, formerly known as Reina González. On the March 4 episode of NXT, Nox lost to Kai again in a steel cage match, after González interfered. On June 7 at NXT TakeOver: In Your House, Nox teamed up with Mia Yim and Shotzi Blackheart to defeat Kai, González and Candice LeRae in a six-woman tag team match. On the July 1 episode of NXT The Great American Bash, Nox defeated Kai, LeRae and Yim in a fatal four-way elimination match to become the number one contender for the NXT Women's Championship. On the July 15 episode of NXT, Nox was unsuccessful in her title match against defending champion Io Shirai.
Tegan Nox