Q Why does my 8-year-old amelanchier have no fruit and little autumn colour?

A Amelanchier grandiflora ‘Robin Hill’ is a lovely small tree that differs from most amelanchiers in its pink flowers in spring, but it should also have brilliant autumn colour and fruits that the birds can enjoy. It’s generally easy to grow and tolerates most soils. The autumn foliage can be rather fleeting, especially in windy autumns but the lack of fruits is strange if it occurs every year. Perhaps it’s in a cold, exposed site? This could impede pollination when the flowers open. or the soil is too dry?