In August 2016, Kohr was called up by Germany U21 for the first time. This came after when he didn't make it to the squad for the Olympics. He made his Germany U21 debut on 2 September 2016, where he played 45 minutes, in a 3–0 win over Slovakia U21. After eight months away, Kohr was called up to the Germany U21 squad for the UEFA European Under-21 Championship and played two times (both as a substitute), as Germany U21 went on to win the tournament.