[BUG]Network, delete option for PublicIpAddress doesn't work

[XiaofeiCao]

Hi team,

We specified the delete option for PublicIpAddress. Later we associated the IP address to a Network Interface and attached it to the VM. When we delete the VM, PublicIpAddress doesn't get deleted.

From the response of the PublicIpAddress creation, seems delete option is not set:
Request(there's "deleteOption": "Delete"):

{
  "location" : "eastus",
  "sku" : {
    "name" : "Standard"
  },
  "properties" : {
    "publicIPAllocationMethod" : "Static",
    "publicIPAddressVersion" : "IPv4",
    "idleTimeoutInMinutes" : 10,
    "deleteOption" : "Delete"
  }
}

Response(there's no delete option property):

{
  "name" : "pip02749cd0",
  "id" : "/subscriptions/REDACTED/resourceGroups/javacsmrg76219/providers/Microsoft.Network/publicIPAddresses/pip02749cd0",
  "etag" : "W/\"11e20b95-4418-4996-81ec-92aa112bae2f\"",
  "location" : "eastus",
  "properties" : {
    "provisioningState" : "Updating",
    "resourceGuid" : "65ab4357-e2f7-48da-b237-7886fcb91d64",
    "publicIPAddressVersion" : "IPv4",
    "publicIPAllocationMethod" : "Static",
    "idleTimeoutInMinutes" : 10,
    "ipTags" : [ ],
    "ddosSettings" : {
      "protectionMode" : "VirtualNetworkInherited"
    }
  },
  "type" : "Microsoft.Network/publicIPAddresses",
  "sku" : {
    "name" : "Standard",
    "tier" : "Regional"
  }
}

cc @weidongxu-microsoft

[XiaofeiCao]

update behavior:

1. Public ip address's delete options seems only work with Network Interface, not VM(inconsistent with the specs description of the property)

   azure-rest-api-specs/specification/network/resource-manager/Microsoft.Network/stable/2023-04-01/publicIpAddress.json

   Lines 547 to 558 in 1671d2d

   	"deleteOption": {
   	"type": "string",
   	"description": "Specify what happens to the public IP address when the VM using it is deleted",
   	"enum": [
   	"Delete",
   	"Detach"
   	],
   	"x-ms-enum": {
   	"name": "DeleteOptions",
   	"modelAsString": true
   	}
   	}

2. When we didn't set deleteOption when attaching PublicIpAddress to NetworkInterface, we can no longer update the deleteOption. Furthermore, the deleteOption property is missing from the response body.
3. When using deployment template however, everything works, including creating with and updating deleteOption.

[vaggelis2018]

Is anyone checking this?
I face the same issue. I need to attach the public IP after the VM creation and delete option is completely ignored.

[vaggelis2018]

following up... if you get the network interface and add the public ip by specifying again the delete option it works. I hope it helps