Why did my Kentucky Wonder pole beans bloom but not produce beans?

Here's a post that might help you - https://www.gardeningknowhow.com/edible/vegetables/beans/bean-blossoms-no-pods.htm

Too hot?

Hi Doris. I'm Cindy. I live in Illinois. I put a garden in every year. A couple years ago my sons built me a raised garden. Since then I have used a mix of: one-third dirt, one-third manure, and one-third sand. I use the sand for water retention. Holds water better than just dirt. I water my garden with a process called "deep root watering." That's a fancy name for using a soaker hose. (That's a long hose with pin holes down the entire length.) This way I water the soil, not the leafs or the plants. And last, I self-pollinate my plants. In approx. the last decade, our country is seeing a loss of bees. Because of this, our plants are growing blossoms but not producing vegetables. The answer to this problem is for all of us to pollinate our plants ourselves. Sounds crazy right? But yet it works. So, 2 or 3 times a week, I go out and gently jiggle anything in my garden that has blossoms. I flick the stalks gently. Don't laugh. I jiggle my tomatoes, peppers, strawberries, zucchini, pumpkins, and the list goes on and on. So, my advice is 3 things: soil mix, deep root watering, and self pollinating. I hope I have helped you, even in a small way. Good luck Doris. Warm wishes being sent your way.

Perhaps not enough water or nutrients

Thanks