I planted some calla lilies in partial sun and none have bloomed. Lots of plant just no flowers. I planted one in full sun and it had 2 flowers on very short stems-they were hard to see for the foliage. I fertilized them once with 10-10-10 fertilizer. They all look very health just no flowers.
Figuring out why a plant is doing, or not doing, something is a process of elimination. Here are a number of possible reasons for you to investigate: https://www.gardeningknowhow.com/ornamental/bulbs/calla-lily/make-calla-lily-bloom.htm