Not able to add ipv6 type Load Balancer IP in kubernetes service

I'm on GKE and I'm trying to expose one application using IPV6 address.

This is my service.yaml

apiVersion: v1
kind: Service
metadata:
  annotations:
    cloud.google.com/neg: '{"ingress":true}'
  labels:
    run: ubuntu
  name: ubuntu
  namespace: default
spec:
  loadBalancerIP: "<ipv6-address>"
  ipFamilies:
  - IPv6
  ipFamilyPolicy: SingleStack
  ports:
  - nodePort: 30783
    port: 5000
    protocol: TCP
    targetPort: 5001
  selector:
    run: ubuntu
  sessionAffinity: None
  type: LoadBalancer

This is my gcloud address list

deletable-pzk-reg-ip2-6           <ipv6-address>/96  EXTERNAL                    us-central1  pzksubnet1  RESERVED

I'm getting this error

  Warning  SyncLoadBalancerFailed  13s (x6 over 2m49s)  service-controller  Error syncing load balancer: failed to ensure load balancer: requested ip "<ipv6-address>" is neither static nor assigned to the LB

Please help me in debugging this.

Below troubleshooting steps can help you to resolve your issue:

1. IPv6 is only for HTTP, SSL Proxy and TCP proxy and make sure you are using one of them.

2. The following documentation describes creation of an Ingress resource.

• Using the following reserve a regional external IPv6 address.

  - gcloud compute addresses create <your-ipv6-address-name> --global --ip-version=IPv6

• Specify the global ip address in the YAML file using the annotation:

  kubernetes.io/ingress.global-static-ip-name: <your-ipv6-address-name>

3. If you want to use load balancer check the Load balancer parameters, example: After reserving the static IP use it as loadBalancedIP in yaml, the load balancer will be created.

apiVersion: v1
kind: Servicemetadata:
  name: my-lb-service
spec:
  type: LoadBalancer
  loadBalancerIP: <ip>

Attaching a blog HTTP on Load Balancer and IPv6 authored by John Hanley for your reference.