After changing the default ingresscontroller from NLB to Classic, the eip allocation are still attached with controller and the LB service. EIP is not supported in classic  
spec:
  clientTLS:
    clientCA:
      name: ""
    clientCertificatePolicy: ""
  endpointPublishingStrategy:
    loadBalancer:
      dnsManagementPolicy: Managed
      providerParameters:
        aws:
          networkLoadBalancer:
            eipAllocations:
            - eipalloc-091ce27435555fbd1
            - eipalloc-0f4b9ac0471b753e2
            - eipalloc-0acc33fddb09b4471
          type: Classic
        type: AWS
      scope: External
    type: LoadBalancerService

    4.17.0-0.nightly-2024-08-09-031511

    100%

    1. Patch the default controller to NLB with EIP allocation
melvinjoseph@mjoseph-mac Downloads % oc -n openshift-ingress-operator patch ingresscontrollers/default --type=merge --patch='{"spec":{"endpointPublishingStrategy":{"type":"LoadBalancerService","loadBalancer":{"scope":"External","providerParameters":{"type":"AWS","aws":{"type":"NLB","networkLoadBalancer":{"eipAllocations":["eipalloc-091ce27435555fbd1","eipalloc-0f4b9ac0471b753e2","eipalloc-0acc33fddb09b4471"]}}}}}}}'
ingresscontroller.operator.openshift.io/default patched

melvinjoseph@mjoseph-mac Downloads % oc -n openshift-ingress delete svc/router-default
service "router-default" deleted
melvinjoseph@mjoseph-mac Downloads %

melvinjoseph@mjoseph-mac Downloads % oc -n openshift-ingress get svc/router-default -oyaml
apiVersion: v1
kind: Service
metadata:
  annotations:
    service.beta.kubernetes.io/aws-load-balancer-eip-allocations: eipalloc-091ce27435555fbd1,eipalloc-0f4b9ac0471b753e2,eipalloc-0acc33fddb09b4471
<----snip---->
ingress                                    4.17.0-0.nightly-2024-08-09-031511   True        False         False      16s
   
     2. changing default ingresscontroller to Classic 
melvinjoseph@mjoseph-mac Downloads %  oc -n openshift-ingress-operator patch ingresscontrollers/default --type=merge --patch='{"spec":{"endpointPublishingStrategy":{"type":"LoadBalancerService","loadBalancer":{"providerParameters":{"type":"AWS","aws":{"type":"Classic"}}}}}}' 
ingresscontroller.operator.openshift.io/default patched

    3. check both ingresscontrollers and lB service status    
 ingresscontroller.operator.openshift.io/default patched
melvinjoseph@mjoseph-mac Downloads % oc -n openshift-ingress get svc/router-default -oyaml
apiVersion: v1
kind: Service
metadata:
  annotations:
    service.beta.kubernetes.io/aws-load-balancer-eip-allocations: eipalloc-091ce27435555fbd1,eipalloc-0f4b9ac0471b753e2,eipalloc-0acc33fddb09b4471
    service.beta.kubernetes.io/aws-load-balancer-healthcheck-healthy-threshold: "2"
<----snip----->

melvinjoseph@mjoseph-mac Downloads % oc get ingresscontroller default -n openshift-ingress-operator -o yaml
apiVersion: operator.openshift.io/v1
kind: IngressController
metadata:
  creationTimestamp: "2024-08-13T04:26:24Z"
  finalizers:
  - ingresscontroller.operator.openshift.io/finalizer-ingresscontroller
  generation: 3
  name: default
  namespace: openshift-ingress-operator
  resourceVersion: "107431"
  uid: 83894ae2-385c-4dc1-8913-f8d405778f1a
spec:
  clientTLS:
    clientCA:
      name: ""
    clientCertificatePolicy: ""
  endpointPublishingStrategy:
    loadBalancer:
      dnsManagementPolicy: Managed
      providerParameters:
        aws:
          networkLoadBalancer:
            eipAllocations:
            - eipalloc-091ce27435555fbd1
            - eipalloc-0f4b9ac0471b753e2
            - eipalloc-0acc33fddb09b4471
          type: Classic
        type: AWS
      scope: External
    type: LoadBalancerService
  httpCompression: {}
  httpEmptyRequestsPolicy: Respond
  httpErrorCodePages:
    name: ""
  replicas: 2
  tuningOptions:
    reloadInterval: 0s
  unsupportedConfigOverrides: null
status:
  availableReplicas: 2
  conditions:
  - lastTransitionTime: "2024-08-13T04:26:25Z"
    reason: Valid
    status: "True"
    type: Admitted
  - lastTransitionTime: "2024-08-13T04:37:34Z"
    message: The deployment has Available status condition set to True
    reason: DeploymentAvailable
    status: "True"
    type: DeploymentAvailable
  - lastTransitionTime: "2024-08-13T04:37:34Z"
    message: Minimum replicas requirement is met
    reason: DeploymentMinimumReplicasMet
    status: "True"
    type: DeploymentReplicasMinAvailable
  - lastTransitionTime: "2024-08-13T08:44:39Z"
    message: All replicas are available
    reason: DeploymentReplicasAvailable
    status: "True"
    type: DeploymentReplicasAllAvailable
  - lastTransitionTime: "2024-08-13T08:44:39Z"
    message: Deployment is not actively rolling out
    reason: DeploymentNotRollingOut
    status: "False"
    type: DeploymentRollingOut
  - lastTransitionTime: "2024-08-13T04:26:25Z"
    message: The endpoint publishing strategy supports a managed load balancer
    reason: WantedByEndpointPublishingStrategy
    status: "True"
    type: LoadBalancerManaged
  - lastTransitionTime: "2024-08-13T08:40:58Z"
    message: The LoadBalancer service is provisioned
    reason: LoadBalancerProvisioned
    status: "True"
    type: LoadBalancerReady
  - lastTransitionTime: "2024-08-13T08:40:55Z"
    message: LoadBalancer is not progressing
    reason: LoadBalancerNotProgressing
    status: "False"
    type: LoadBalancerProgressing
  - lastTransitionTime: "2024-08-13T04:26:25Z"
    message: DNS management is supported and zones are specified in the cluster DNS
      config.
    reason: Normal
    status: "True"
    type: DNSManaged
  - lastTransitionTime: "2024-08-13T04:26:42Z"
    message: The record is provisioned in all reported zones.
    reason: NoFailedZones
    status: "True"
    type: DNSReady
  - lastTransitionTime: "2024-08-13T08:40:58Z"
    status: "True"
    type: Available
  - lastTransitionTime: "2024-08-13T08:44:39Z"
    status: "False"
    type: Progressing
  - lastTransitionTime: "2024-08-13T08:46:46Z"
    status: "False"
    type: Degraded
  - lastTransitionTime: "2024-08-13T04:26:25Z"
    message: IngressController is upgradeable.
    reason: Upgradeable
    status: "True"
    type: Upgradeable
  - lastTransitionTime: "2024-08-13T04:26:25Z"
    message: No evaluation condition is detected.
    reason: NoEvaluationCondition
    status: "False"
    type: EvaluationConditionsDetected
  - lastTransitionTime: "2024-08-13T08:46:46Z"
    message: Canary route checks for the default ingress controller are successful
    reason: CanaryChecksSucceeding
    status: "True"
    type: CanaryChecksSucceeding
  domain: apps.mjoseph-df.qe.devcluster.openshift.com
  endpointPublishingStrategy:
    loadBalancer:
      dnsManagementPolicy: Managed
      providerParameters:
        aws:
          classicLoadBalancer:
            connectionIdleTimeout: 0s
          networkLoadBalancer:
            eipAllocations:
            - eipalloc-091ce27435555fbd1
            - eipalloc-0f4b9ac0471b753e2
            - eipalloc-0acc33fddb09b4471
          type: Classic
        type: AWS
      scope: External
    type: LoadBalancerService
  observedGeneration: 3
  selector: ingresscontroller.operator.openshift.io/deployment-ingresscontroller=default
  tlsProfile:
    ciphers:
    - ECDHE-ECDSA-AES128-GCM-SHA256
    - ECDHE-RSA-AES128-GCM-SHA256
    - ECDHE-ECDSA-AES256-GCM-SHA384
    - ECDHE-RSA-AES256-GCM-SHA384
    - ECDHE-ECDSA-CHACHA20-POLY1305
    - ECDHE-RSA-CHACHA20-POLY1305
    - DHE-RSA-AES128-GCM-SHA256
    - DHE-RSA-AES256-GCM-SHA384
    - TLS_AES_128_GCM_SHA256
    - TLS_AES_256_GCM_SHA384
    - TLS_CHACHA20_POLY1305_SHA256
    minTLSVersion: VersionTLS12

    spec:
  clientTLS:
    clientCA:
      name: ""
    clientCertificatePolicy: ""
  endpointPublishingStrategy:
    loadBalancer:
      dnsManagementPolicy: Managed
      providerParameters:
        aws:
          networkLoadBalancer:
            eipAllocations:
            - eipalloc-091ce27435555fbd1
            - eipalloc-0f4b9ac0471b753e2
            - eipalloc-0acc33fddb09b4471
          type: Classic
        type: AWS
      scope: External
    type: LoadBalancerService
  httpCompression: {}
  httpEmptyRequestsPolicy: Respond
  httpErrorCodePages:
    name: ""
  replicas: 2
  tuningOptions:
    reloadInterval: 0s
  unsupportedConfigOverrides: null

spec should be 
spec:
  clientTLS:
    clientCA:
      name: ""
    clientCertificatePolicy: ""
  httpCompression: {}
  httpEmptyRequestsPolicy: Respond
  httpErrorCodePages:
    name: ""
  replicas: 2
  tuningOptions:
    reloadInterval: 0s
  unsupportedConfigOverrides: null

    
status should be
  endpointPublishingStrategy:
    loadBalancer:
      dnsManagementPolicy: Managed
      providerParameters:
        aws:
          classicLoadBalancer:
            connectionIdleTimeout: 0s
          type: Classic
        type: AWS
      scope: External
    type: LoadBalancerService
  observedGeneration: 1
  selector: ingresscontroller.operator.openshift.io/deployment-ingresscontroller=default

    Deleting the LB service will remove the annotation from the svc, but no change in ingresscontroller config