terraform-provider-azurerm: azurerm_app_service transient error - "RepoUrl VSTSRM is not supported"

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Terraform (and AzureRM Provider) Version

Terraform version: 0.13.4

Affected Resource(s)

azurerm: version = "=2.30.0"

Terraform Configuration Files

resource "azurerm_function_app" "azureblobfunction" {
  name                       = "${module.global_variables.applicationName}-azureblobfunction-${var.environment}"
  location                   = azurerm_resource_group.resourcegroup.location
  resource_group_name        = azurerm_resource_group.resourcegroup.name
  app_service_plan_id        = azurerm_app_service_plan.plan.id
  #storage_connection_string = azurerm_storage_account.azureblobfunction_storage.primary_connection_string
  storage_account_name       = azurerm_storage_account.azureblobfunction_storage.name
  storage_account_access_key = azurerm_storage_account.azureblobfunction_storage.primary_access_key
  
  os_type                    = "linux"
  version                    = "~3"

  site_config {
    always_on                = true
    
    ftps_state = "Disabled"
  }

  app_settings = {
    "FUNCTIONS_WORKER_RUNTIME"              = "dotnet"
    "WEBSITE_RUN_FROM_PACKAGE"              = "1"
    "WEBSITES_ENABLE_APP_SERVICE_STORAGE"   = "true"
    "WEBSITE_ENABLE_SYNC_UPDATE_SITE"       = "true"
    "WEBSITE_NODE_DEFAULT_VERSION"          = "10.14.1"
    "APPINSIGHTS_INSTRUMENTATIONKEY"        = ""
    "azuresearch_storage_connectionstring"  = azurerm_storage_account.azuresearch_storage.primary_blob_connection_string
    "ApiKey"                                = var.*******
    "BaseUrl"                               = "https://${azurerm_app_service.*******.default_site_hostname}"
  }

  https_only = true
  identity {
    type = "SystemAssigned"
  }
}

Debug Output

Error: failed to create App Service Source Control for "*******-azureblobfunction-dev" (Resource Group ""*******-dev"): web.AppsClient#CreateOrUpdateSourceControl: Failure sending request: StatusCode=400 -- Original Error: Code="BadRequest" Message="Operation not supported: RepoUrl VSTSRM is not supported." Details=[{"Message":"Operation not supported: RepoUrl VSTSRM is not supported."},{"Code":"BadRequest"},{"ErrorEntity":{"Code":"BadRequest","ExtendedCode":"51024","Message":"Operation not supported: RepoUrl VSTSRM is not supported.","MessageTemplate":"Operation not supported: {0}","Parameters":["RepoUrl VSTSRM is not supported."]}}]

  on azurefunction.tf line 51, in resource "azurerm_function_app" "azureblobfunction":
  51: resource "azurerm_function_app" "azureblobfunction" {

Panic Output

N/A

Expected Behavior

I would expect the deployment to succeed.

Actual Behavior

The deployment did not succeed

Steps to Reproduce

1. terraform apply
2. Deploy an Azure blob function with the following Azure DevOps task:

        - task: AzureFunctionApp@1
          displayName: 'Azure functions app deploy'
          inputs:
            azureSubscription: '${{ parameters.AZURESUBSCRIPTION }}'
            appType: functionApp
            appName: '${{ parameters.PREFIX }}"*******-azureblobfunction-${{ parameters.ENVIRONMENT }}'
            package: '$(System.ArtifactsDirectory)/dropAzureBlobFunction/blob$(Build.BuildId).zip'

Important Factoids

Deploying to Azure West Europe

References

The following issue is about the same problem: https://github.com/terraform-providers/terraform-provider-azurerm/issues/8171

This topic contains a lot more information on this subject.