Q.Why Do My Cucumbers Die
I have many flowers with small cucumbers. But when the female flower dries up, the little cucumber shrivels and falls off also. Why, and what can I do about it? I do not have a single growing cucumber on the vines, but plenty of male and female flowers.

Certified GKH Gardening Expert
This is typically caused by a pollination issue. These articles will help:
https://www.gardeningknowhow.com/garden-how-to/beneficial/insect-pollination-process.htm
https://www.gardeningknowhow.com/edible/fruits/melons/hand-pollinating-melons.htm (melons and cucumbers are hand pollinated the same way.)