Migration netflix feign in Springboot 1.x to openfeign in Springboot 2.x

that's the solution from the Feign documentation:

If we want to create multiple feign clients with the same name or url so that they would point to the same server but each with a different custom configuration then we have to use contextId attribute of the @FeignClient in order to avoid name collision of these configuration beans.

@FeignClient(contextId = "fooClient", name = "stores", configuration = FooConfiguration.class)
public interface FooClient {
    //..
}

@FeignClient(contextId = "barClient", name = "stores", configuration = BarConfiguration.class)
public interface BarClient {
    //..
}

https://github.com/spring-cloud/spring-cloud-openfeign/pull/90/commits/82fa5181fdd2e23e7414521f468ecea88e17d157

Probably you have multiple @FeignClient definitions with the same name attribute.