inayima >>
saturday december 1 - 15:52, Edited
saturday december 1 - 17:03 The finals will be played after the qualifications end, if one the finalists of the league already qualified to the groups stage of the euros the next ranked team on the league (that failed to earn a place) will play the finals instead.
So this actually gives them a second chance to play the euros
Let's say Belgium ends third on their euro qualification group, if one of the finalists (like England) qualified directly they will play the Nations League finals instead , thus giving them another chance to play the Euro 2020
Basically for league A this are something like official friendlies, for league B an easier chance to qualify if they failed to normal route and for C and D it's almost their only actual chance.