Hubbard claimed the national body had no right to ban athletes from an event they had been invited to.
"While the Tribunal appreciated that the decision by OWNZ may be seen as overly restrictive by some, it accepted that OWNZ must have the ability to create and implement strategies and processes that it believes are best suited in identifying and selecting New Zealand's best weightlifters," said the Tribunal.
"The Tribunal concluded that there was no basis to interfere with a rational and properly available decision by OWNZ. The appeal was accordingly dismissed."
Hubbard was formerly Gavin Hubbard, son of former Auckland mayor Dick Hubbard, before transitioning to female.
Earlier this year, she became the first trans-gender athlete to win an international weightlifting title, when she won the 90kg+ class at the Australian International & Auckland Open in Melbourne.