Adding a "replica" block to "azurerm_app_configuration" throws "expanding replica: location ("X") of replica "Y" is duplicated with replica """

[owattley-rotageek]

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Terraform Version

1.6.4

AzureRM Provider Version

3.82.0

Affected Resource(s)/Data Source(s)

azurerm_app_configuration

Terraform Configuration Files

resource "azurerm_app_configuration" "app_config" {
  name                     = "my-app-config"
  resource_group_name      = "my-resource-group"
  location                 = "North Europe"
  sku                      = "standard"
  public_network_access    = "Disabled"
  purge_protection_enabled = true

  # geo replicas

  replica {
      name = "secondary"
      location = "UK South"
  }
  
}

Debug Output/Panic Output

{
      "mode": "managed",
      "type": "azurerm_app_configuration",
      "name": "app_config",
      "provider": "provider[\"registry.terraform.io/hashicorp/azurerm\"]",
      "instances": [
        {
          "status": "tainted",
          "schema_version": 0,
          "attributes": {
            "encryption": [],
            "endpoint": null,
            "id": "/subscriptions/***/resourceGroups/***/providers/Microsoft.AppConfiguration/configurationStores/***",
            "identity": [],
            "local_auth_enabled": true,
            "location": "northeurope",
            "name": "***",
            "primary_read_key": null,
            "primary_write_key": null,
            "public_network_access": "Disabled",
            "purge_protection_enabled": true,
            "replica": [
              {
                "endpoint": "",
                "id": "",
                "location": "UK South",
                "name": ""
              },
              {
                "endpoint": "",
                "id": "",
                "location": "uksouth",
                "name": "secondary"
              }
            ],
            "resource_group_name": "***",
            "secondary_read_key": null,
            "secondary_write_key": null,
            "sku": "standard",
            "soft_delete_retention_days": 7,
            "tags": {
              "customer": "shared",
              "terraform": "true"
            },
            "timeouts": null
          },
          "sensitive_attributes": [],
          "private": "***"
        }
      ]

Expected Behaviour

The app config resource should be created in northeurope with a replica in uksouth

Actual Behaviour

azurerm provider complains that the replica is a duplicate of an empty string

 Error: expanding `replica`: location ("secondary") of replica "uksouth" is duplicated with replica ""
│
│   with azurerm_app_configuration.app_config,
│   on app_config.tf line 20, in resource "azurerm_app_configuration" "app_config":
│   20: resource "azurerm_app_configuration" "app_config" {
│
╵

Steps to Reproduce

1. run terraform apply on any valid azurerm_app_configuration with a single valid replica block defined

Important Factoids

no

References

No response

[owattley-rotageek]

After posting the state file definition into this issue I realised the duplicate replicas with "UK South" and "uksouth" is the source of the problem. I tried changing the definition of the replica block as follows and it works:

replica {
      name = "secondary"
      location = "uksouth" #<<<<<<<
  }

Looks like there's a bug in converting the location string from frtiendly format to a value that the api accepts.

The docs give an example using the friendly name:

  replica {
    name     = "replica1"
    location = "West US" #<<<<<<<<<<<<
  }

https://registry.terraform.io/providers/hashicorp/azurerm/latest/docs/resources/app_configuration

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