Ingress rule cannot resolve the backend server ip address

Trying to follow How to Set Up an Nginx Ingress with Cert-Manager on DigitalOcean Kubernetes tutorial for setting up the ingress rule for backendApi

https://www.digitalocean.com/community/tutorials/how-to-set-up-an-nginx-ingress-with-cert-manager-on-digitalocean-kubernetes

The backend service are created correctly .

kubectl get svc

NAME         TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE
echo1        ClusterIP   10.245.254.205   <none>        80/TCP     3h
echo2        ClusterIP   10.245.187.179   <none>        80/TCP     3h

Ingress resource are created correctly

kubectl get ingress echo-ingress

NAME           HOSTS                                 ADDRESS         PORTS     AGE
echo-ingress   echo1.example.com,echo2.example.com   157.230.67.78   80        3h

And I see external load balancer is created.

But it seems ingress cannot find the backend server ip , it shows <none>

kubectl describe ingress echo-ingress

Name:             echo-ingress
Namespace:        default
Address:          157.230.67.78
Default backend:  default-http-backend:80 (<none>)
Rules:
  Host               Path  Backends
  ----               ----  --------
  echo1.example.com  
                        echo1:80 (<none>)
  echo2.example.com  
                        echo2:80 (<none>)
Annotations:
Events:  <none>

I don’t think it would forward traffic , should it be sth like

  Host               Path  Backends
  ----               ----  --------
  echo1.example.com  
                        echo1:80 (10.245.254.205:80)

like in the official tutorial ?