Also with the continental cup for NZ, I have simulated 3 seasons with your db
First season had Auckland City and NZ Knights compete (NZ Knights unsure, Auckland City won the NZ Premiership last season)
Second season had NZ Knights (17th in A-League, ANZAC Cup 5th round, Did Not Compete in Chatham Cup) and Auckland United (5th in the NZ Premier League, Chatham Cup Runner Up, ANZAC Cup Semi Finalist)
Third Season had Auckland City (A-League 2 Winners - yes that is back 2 back promotions, ANZAC Cup 5th Round) and Auckland United (5th in NZ Premier, Chatham Cup 4th Round, ANZAC Cup 5th Round, Also won the OFC CL)
I have a feeling it's getting the highest placing team in the Leagues excluding Phoenix (NZ Knights were relegated in season 2 before a 9th place AL2 finish while Auckland City had back 2 back promotions to reach the AL and finished 13th), I have a feeling it has something to do with the Phoenix continental cup Nation set to Aus and other NZ clubs are set to NZ, probably wrong tho.