Great. In the CSV file you sent me, all the columns were mashed into one with ; as the separator. This won’t work. Something seems to be going wrong with your CSV save, perhaps the Windows Regional Settings. (??)
Looking at your XLS file, there was one mistake; the player_teams column has to contain the team SLUG, not the NAME. You can find the team slugs on the Teams screen. In your case, the slug for the team U11 Micros is probably u11-micros.
But it sounds like you got it figured out. Super.
Regards,
-Mark