Hello @Zachary Whyte
i understand that you can move players between the first and U19 to make them able to play in U19 matches, but my issue is that by moving them they are taken out of the mentoring teams and i'm not sure what effect that has on their mentoring ....
i made this post hoping that maybe there was something i was missing or that I wasn't doing properly.
I'm aware that for this version of FM there is not much to be done but i'm hoping that for the next one there will be possible to make available for youth teams players from the first team even though the matches are scheduled in the same day or maybe the mentoring system is reworked...
one possible simple solution would be to that when you make a player available for the youth team you cannot select him for the first team's matches until you deselect him.
it's not a big issue but for the sake of realism and from the programming standpoint, i think it's doable to make players that are not selected in the first team, starting team and subs, to be available for the youth teams even if their matches are scheduled in the same day.
Thank you!