Junior career In May 2019, 16-year-old Mboma won the
800 and
1500 metres events at the school's Cossasa Games in
Manzini, Eswatini (no
WA recognition, its database shows 2m 18.68s in the 800 m on 18 May in
Windhoek,
Namibia). In July, at the
Southern Africa Championships in
Moka, Mauritius, she won a bronze medal in the 800 m, clocking 2:17.11. In November 2020, Mboma won gold medals in the 800 and 1500 m races at the Namibian Championships in
Windhoek. On 9 December, she won the 400 and 800 m events in
Pretoria, South Africa; in the former distance she set her
personal best of 51.81 s. She clocked an even better time of 51.57 s at the Namibian Youth Games in Windhoek on 17 December.
2021 , and former president
Sam Nujoma with Mboma at the Sam Nujoma Foundation, Walvis Bay, in 2021 On 27 March, the 18-year-old improved to 50.97 s and won the 400 m race at the Grand Prix Meet in
Oshakati,
Namibia. On 11 April, at the All Comers Meet in
Lusaka, Zambia, she massively lowered her PB to 49.24 s. She set the Namibian senior and unofficial world under-20 record, breaking previous
WU20R mark of 49.42, which was set in 1991 by
Gritt Breuer.
Beatrice Masilingi came second in 49.53 s. A week later, on 17 April, at the Namibian Championships in Windhoek, Mboma took 0.2 s off her record, stopping the clock at 49.22 s. The next day, the women's 4 × 100 m relay team set the Namibian record at 44.78 s. On 7 June, Mboma set new PB, Namibian and a meet record of 22.67 s in the 200 m at the
Josef Odložil Memorial in
Prague to take a gold medal. On 30 June, Mboma set an unratified African senior and new world U20 record in the 400 m greatly lowering her PB even further. She timed 48.54 seconds to break the 49.10 s 1996's mark of
Falilat Ogunkoya-Osheku and win the
Irena Szewińska Memorial in
Bydgoszcz, Poland, becoming the 7th fastest woman of all time in the event with the 12th fastest result ever. She concluded her very successful season with a win on 9 September at the Diamond League final in
Zürich, clocking 21.78 s to take her first Diamond Trophy. In the process, she also set a new
World under 20 and
African record by breaking her own record from the Olympics by 0.03 seconds. Following her record-breaking season, Mboma was awarded the BBC African Sports Personality of the Year award. She also won the
Confederation of African Athletics (CAA) African Female Hope Athlete award beating competition from Kenya's
Jackline Chepkoech, and Nigeria's
Tobi Amusan and
Imaobong Uko.
2022 Mboma opened up the season on 15 January with a 11.25 s 100 m performance in
Swakopmund.
Testosterone levels controversy In July 2021, the
Namibian National Olympic Committee announced that Mboma and fellow Namibian sprinter
Beatrice Masilingi would not be allowed to compete in the 400 m competition at the
Tokyo Olympics, due to
World Athletics rules requiring that athletes with certain
DSDs participating in women's running events from 400 metres to one mile cannot have blood
testosterone levels above 5 nmol/L. Mboma and Masilingi had undergone a medical assessment at a training camp in Italy in early 2021, at which they tested positive for elevated testosterone levels due to a naturally occurring genetic condition. The World Athletics regulations in question, however, apply only to athletes with an
XY karyotype and a DSD diagnosis, casting doubt on Xoagub's statement. Xoagub also accused World Athletics of breaking a confidentiality agreement concerning the results of the initial medical assessment. Prior to the 2020 Olympics, the Namibia NOC issued an official statement acknowledging the assessment of World Athletics while stating that the athletes had previously been unaware of their condition. She was one of the athletes whose cases were profiled in
Phyllis Ellis's 2022 documentary film
Category: Woman. ==Achievements==