In 2017, Dahl-Jessen competed in the senior men's race at the 2017 IAAF World Cross Country Championships held in Kampala, Uganda.
[1] In the same year, he also represented Denmark at the 2017 Summer Universiade held in Taipei, Taiwan in the men's 1500 metres event.
[2] In 2019, Dahl-Jessen competed in the senior men's race at the 2019 IAAF World Cross Country Championships held in Aarhus, Denmark.
[4] In 2021, he competed in the men's 3000 metres event at the 2021 European Athletics Indoor Championships held in Toruń, Poland.
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