Why is this a match between the French first team and the French second team?

This game is about the semi-final match between France and Monaco. Because there are about 755,000 Monegasques in France, which is the second largest immigrant group in France, accounting for about 18.4% of the French population. At the same time, there are also many Monegasque students in France. There are many people in France who have both French and Monaco nationality, so this game is nicknamed France First Team VS France Second Team.