Welcome to GoY.
Have you pruned it at all? As pruning at the wrong time of year will remove the flowers. My understanding is ,it is in pruning group 9
RHS says
2. Late summer flowering evergreen shrubs (Pruning group 9)

Timing: Prune mid- to late spring.
Examples: Escallonia, Eucryphia, Fatsia, Hebe, Rosmarinus
Pruning: This group of evergreen shrubs bloom in summer and late autumn on the previous or current year's growth. They need little pruning. Prune lightly removing unsightly shoots as required. Those shrubs recommended for hedges, topiary or foliage often require regular trimming and tolerate heavier pruning.

Many shrubs need plenty of water so if you have had a dry spring that may have restricted flower formation.

Not sure how old they need to be before they flower.

Have you fed it at all? perhaps next year feed it in the early spring when new growth starts.