I noticed this maybe an update or two ago, but this screen (select a nation to message) used to work well tracking the last login dates of each player. Now, it has dates that are weeks into the future and doesn't label any players as "inactive".
Screenshot_20201112-135020_CON WW3.jpg
Screenshot_20201112-135020_CON WW3.jpg
but, that's just my 2 cents' worth