Unable to create service type of LoadBalancer for private subnet in AWS

Issue

• Unable to create service type of LoadBalancer for private subnet in AWS as the service is pending state.

svc-xxx      LoadBalancer   172.30.xx.xx   <pending>      80/TCP,443/TCP    21d

• The kube-controller-manager pods shows the error:

aws.go:3605] EnsureLoadBalancer(ocp-xxxx, openshift-storage, svc-xxx, us-xxxx-x, [{mgmt TCP <nil> xx {x xxxx } xxxxx} {mgmt-https TCP <nil> xxx {x xxxx } xxxxx} {bg-https TCP <nil> xxxx {x xxxx } xxxxx} {hosted-agents-https TCP <nil> xxxx {x xxxx } xxxxx}], map[prometheus.io/port:xxxx prometheus.io/scheme:http prometheus.io/scrape:true service.beta.openshift.io/serving-cert-secret-name:svc-xxx-serving-cert])
aws.go:3389] Ignoring private subnet for public ELB "subnet-xxxxxxxxx"
aws.go:3389] Ignoring private subnet for public ELB "subnet-xxxxxxxxx"
aws.go:3389] Ignoring private subnet for public ELB "subnet-xxxxxxxxx"
controller.go:244] error processing service openshift-storage/svc-xxx (will retry): failed to ensure load balancer: could not find any suitable subnets for creating the ELB