At the 2020 World Junior Speed Skating Championships in February 2020, Kongshaug won the gold medal in the 1000m event.

At the World Single Distances Speed Skating Championships in 2021, he finished 14th in the 1000m, 18th in the 5000m and was not selected for the team pursuit.

Having qualified for the 2022 Winter Olympics, which took place in February 2022, where in the 1500m event, he finished 1.18 s behind the Dutch champion Kjeld Nuis, having competed in the tenth race against the silver medalist Thomas Krol.

With Kongshaug's teammates Hallgeir Engebråten and Sverre Lunde Pedersen, the Norwegian relay obtained the best qualifying time then won in the semi-final against the Dutch and then against the Russians in the final, the latter having nevertheless established a new Olympic record in their duel against the Americans.

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