If the plant was grown from seed then it may have gone to vegetative growth every year and failed to form flower buds. This might be just a genetic peculiarity of the specimen or to do with the environment it is planted in. The ability of the species to switch between vegetative growth or flower bud formation makes long periods of non-flowering a possibility.
If, however, the plant was grown from a cutting or purchased from a nursery, the problem is likely to be related to the plant’s environment. This is because no nursery person would propagate from a non-flowering tree.