Do you know how old the plants are? When did you transplant them? They look a little small, so maybe they just need to grow a bit before setting flowers.

Give them a little time to grow bigger.

I'm not a pepper grower but I was thinking about it.
Are the peppers in the photos spaced out sufficiently?
Looks a little tight.

The peppers look nice & green, but a little small to be fruiting. One thing to keep in mind when you're planting is the watering needs for the vegetables, Cucumbers need a lot more water than peppers, so it's going to be tricky to keep the cukes well-watered without over-watering the peppers.