azurerm_windows_function_app not updating WEBSITE_CONTENTAZUREFILECONNECTIONSTRING when storage backend changes

[dantape]

Is there an existing issue for this?

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Terraform Version

1.4.6

AzureRM Provider Version

3.61.0

Affected Resource(s)/Data Source(s)

azurerm_windows_function_app

Terraform Configuration Files

provider "azurerm" {
  features {}
}

resource "azurerm_resource_group" "example" {
  name     = "example-resources"
  location = "West Europe"
}

resource "azurerm_storage_account" "example" {
  name                     = "windowsfunctionappsa"
  resource_group_name      = azurerm_resource_group.example.name
  location                 = azurerm_resource_group.example.location
  account_tier             = "Standard"
  account_replication_type = "LRS"
}

resource "azurerm_service_plan" "example" {
  name                = "example-app-service-plan"
  resource_group_name = azurerm_resource_group.example.name
  location            = azurerm_resource_group.example.location
  os_type             = "Windows"
  sku_name            = "Y1"
}

resource "azurerm_windows_function_app" "example" {
  name                = "example-windows-function-app"
  resource_group_name = azurerm_resource_group.example.name
  location            = azurerm_resource_group.example.location

  storage_account_name       = azurerm_storage_account.example.name
  storage_account_access_key = azurerm_storage_account.example.primary_access_key
  service_plan_id            = azurerm_service_plan.example.id

  site_config {}
}

Debug Output/Panic Output

# azurerm_windows_function_app.example will be updated in-place
  ~ resource "azurerm_windows_function_app" "example" {
        id                                = ""
        name                              = "fa-ea2-12345678-poc"
      ~ storage_account_access_key        = (sensitive value)
      ~ storage_account_name              = "stea2funcstrg12345678" -> "stea2funcstrg87654321"

        # (22 unchanged attributes hidden)

        # (1 unchanged block hidden)
    }

Expected Behaviour

The AzureWebJobsStorage and WEBSITE_CONTENTAZUREFILECONNECTIONSTRING app settings are both updated with the new storage account.

Actual Behaviour

Only AzureWebJobsStorage is updated and WEBSITE_CONTENTAZUREFILECONNECTIONSTRING retains the original value. This is a problem because the original storage account no longer exists.

Steps to Reproduce

1. Create resources with terraform apply.
2. Change the name of the storage account.
3. Update resources with terraform apply.

Important Factoids

No response

References

This could be related to:
#21140
#21212

[rcskosir]

@dantape Thank you for opening this issue. I agree with you that this issue is related to #21140 and believe #21212 will add the change you are looking for, so I have linked this issue to the PR.

[github-actions]

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