azure_rm_virtualmachinescaleset_module: The platform_fault_domain_count parameter cannot be updated! about azure

[Fred-sun]

@deubert-it The parameter 'platform_fault_domain_count' cannot be updated in the python SDK. When we manage this resource, we first check whether the resource exists, if it does not exist, create a new resource, if it does exist, compare the parameter, if the parameter is incorrectly configured. We will print the error using the module's 'self.fail' method and do not continue! Thank you!

[deubert-it]

@Fred-sun thank you for your response, which I understand, but it would mean I just can't use it with an existing VMSS that was created a long time ago with an older version.

[Fred-sun]

@deubert-it Sorry for replying you so late. The parameter 'platform_fault_domain_count parameter' has been added in #779. The default value of this parameter is 1. If you management VMSS by 'azure_rm_virutalmachinescaleset.py', please make sure the 'platform_fault_domain_count' value same with the exsiting VMSS. This will not prompt the 'platform_fault_domain_count parameter' question. Thank you!
In addition, to make sure my idea is correct, can you provide your VMSS information and use cases?

Test case:
- name: Create VMSS with I(orchestration_mode=Flexible)
  azure_rm_virtualmachinescaleset:
    resource_group: "{{ resource_group }}"
    name: testVMSS{{ rpfx }}
    vm_size: Standard_A1_v2
    admin_username: testuser
    single_placement_group: false
    platform_fault_domain_count: 2
    public_ip_per_vm: true
    ssh_password_enabled: false
    ssh_public_keys:
      - path: /home/testuser/.ssh/authorized_keys
        key_data: "ssh-rsa *****************@qq.com"
    virtual_network_name: VMSStestVnet01
    subnet_name: VMSStestSubnet01
    managed_disk_type: Standard_LRS
    orchestration_mode: Flexible
    os_disk_caching: ReadWrite
    image:
      offer: 0001-com-ubuntu-server-focal
      publisher: Canonical
      sku: 20_04-lts
      version: latest

VMSS facts:
        "vmss": [
            {
                "id": "/subscriptions/xxxxxxxxxxxxxxx/resourceGroups/v-xisuRG013/providers/Microsoft.Compute/virtualMachineScaleSets/testVMSSfredrpfx01",
                "identity": {
                    "type": "UserAssigned",
                    "user_assigned_identities": {
                        "/subscriptions/xxxxxxx/resourceGroups/AzSecPackAutoConfigRG/providers/Microsoft.ManagedIdentity/userAssignedIdentities/AzSecPackAutoConfigUA-eastus": {}
                    }
                },
                "location": "eastus",
                "name": "testVMSSfredrpfx01",
                "orchestration_mode": "Flexible",
                "platform_fault_domain_count": 1,
                "provisioning_state": "Succeeded",
                "single_placement_group": false,
                "sku": {
                    "capacity": 1,
                    "name": "Standard_A1_v2",
                    "tier": "Standard"
                },
                "tags": {
                    "azsecpack": "nonprod",
                    "platformsettings.host_environment.service.platform_optedin_for_rootcerts": "true"
                }.

        .................................

[Fred-sun]

kindly ping!