You need to set elb.id as service annotation or set loadBalancerIP in specs. Example yaml:
apiVersion: v1
kind: Service
metadata:
name: test-svc
annotations:
kubernetes.io/elb.id: "XXXXXXX-XXXX-XXXX-XXXX-XXXXXXXX"
spec:
type: LoadBalancer
selector:
app: test-app
ports:
- port: 4000
targetPort: 3000