Q.purple leaf sand cherry
The tree is about 10 years old and its very full and tall. It produces buds but never flowers. We live in Connecticut, tree is on the south Side of the house it gets plenty of sun. What am I doing wrong?

Flowers can be minimum and not last very long. Some varieties do not bloom well, especially if grown in a warmer climate.
Optimize care as covered in the article below.
https://www.gardeningknowhow.com/ornamental/trees/sand-cherry/purple-leaf-sandcherry-info.htm