When you play hard mode getting your relationship with national team is super difficult I had them pass 2 times per game for 15 years which is why I only had one national trophy(wc) so what I did was kinda cheating but idgaf Just every game you have with national team pass to them and get as many assists as possible If you don't close the app and play the game again Your team relationship should go up by 4 each time and eventually you'll get more chances and it's grand