terraform-azure/quickstart/201-function-app-key-vault-ref/providers.tf

terraform {
  required_version = ">=1.0"

  required_providers {
    azurerm = {
      source  = "hashicorp/azurerm"
      version = "~>3.8"
    }
  }
}
provider "azurerm" {
  features {
    key_vault {
      purge_soft_delete_on_destroy    = true
      recover_soft_deleted_key_vaults = true
    }
  }
}