You wouldn't expect them to breed instantly you know, yes they are known to be fast breeders(if they do breed) but sometimes it takes time and also sometimes they prefer their nest move to a better place.

Try moving the nests around they might not like each other they might still be not used to the cage

Put the nest up and wait.

I have two males and two females in a large avairy. The males sleep together at night an build a nest but don't breed with the females. When the male gets too close to the female, they would clink their beaks together. What should I do? Also I got them a week ago.