Issue with nested loop for dynamic block within a Azure vm resource

Terraform
1

Trying to build iteration of multiple vm’s and inside iteration of multiple disks per VM as per input format and getting the below error. Please help

Error: Missing required argument

on modules/azure-vm/main.tf line 118, in resource “azurerm_virtual_machine” “vm”:
118: content {

The argument “name” is required, but no definition was found.

terrafor.tfvars

instance = [{name="test1",size="Standard_E4s_v4",os_disk_size_gb=512, data_disk_details=[{name = "data",lun = 0,size=1060,caching = "None",sku = "Premium_LRS",storage_url = "",accelerated = false},{name = "data1",lun = 1,size=4060,caching = "None",sku = "Premium_LRS",storage_url = "",accelerated = false}]},{name="test2",size="Standard_E2s_v4",os_disk_size_gb=128, data_disk_details=[{name = "data",lun = 0,size=2060,caching = "None",sku = "Premium_LRS",storage_url = "",accelerated = false}]}]

variables.tf

variable "instance" {
  type = list(object({
   name = string
   os_disk_size_gb = number
   size = string
   data_disk_details = list(object({
   name = string
   lun  = number
   size = number
   caching = string
   accelerated = bool
   sku = string
   storage_url = string
}))
  }))
}

main.tf


locals {
  instance =  flatten([
   for value in  var.instance:  {
     name = value.name
     size = value.size
     os_disk_size_gb = value.os_disk_size_gb

     data_disks =  [for value in value["data_disk_details"]: {
     name        = value.name != "" ? value.name : "disk-data-${value.lun}"
     lun         = value.lun
     size        = value.size
     caching     = value.caching != "" ? value.caching : "None"
     accelerated = value.accelerated  != "" ? value.accelerated : false
     sku         = value.sku != "" ? value.sku : "Standard_LRS"
     storage_url = value.storage_url
}]
}])
 instance_map = {
    for value in var.instance: "${value.name}" => value
}
}

resource "azurerm_virtual_machine" "vm" {
  for_each = local.instance_map
  name                = each.value.name
  location            = var.location
  resource_group_name = var.resource_group_name
  vm_size             = each.value.size

  dynamic "storage_data_disk" {
    for_each = var.instance
    iterator = object
    content {
    dynamic "data_disk_details" {
    for_each = lookup(object.value, "data_disk_details", [])
    content {
    name                      = "${each.value.name}-${data_disk_detais.value["name"]}"
    lun                       = data_disk_detais.value["lun"]
    create_option             = "Empty"
    disk_size_gb              = data_disk_detais.value["disk_size_gb"]
    caching                   = data_disk_detais.value["caching"]
    write_accelerator_enabled = data_disk_detais.value["write_accelerator_enabled"]
    managed_disk_type         = data_disk_detais.value["managed_disk_type"]
    vhd_uri                   = data_disk_detais.value["storage_url"] != "" ? "${data_disk_detais.value["storage_url"]}/${each.value.name}-${data_disk_detais.value.name}.vhd" : null
}
}
}
}}