if it not show the notification, i don't know any tips except you need to report it to CS nordeus in game.

or you need manually setting alarm 5 minute before your game with your phone alarm if you urgently need that notification.

for my self, usually i don't really dependen on notif when to play, cause i always remember when next i play. or i just casually setting formation for next match watch or not i do my best setting. have been play the game for 3 years now, i just play casually lately.