Jamal Musiala scored a second-half hat-trick after coming off the bench, contributing to Bayern's dominant performance against the amateur side.
Auckland City, the only non-professional team in the 32-team tournament, faced a significant disparity in squad value, with Bayern's estimated at £770m compared to Auckland's £1.2m.
Despite winning multiple Oceania Champions League titles, Auckland City's players had to take annual leave to participate in the Club World Cup due to their amateur status.
Auckland City's participation in the Club World Cup will cost the club more than it makes in a year, but they will be compensated with prize money.