I am trying to create 3 subnets from a VNET address space in Azure
Below is my code

locals {
  subnets = {
    "snet-general-prod-cus-5315" = {
      cidrs = [cidrsubnet(data.azurerm_virtual_network.default.address_space[0],3,0)]
      service = { endpoints = [
          "Microsoft.KeyVault",
          "Microsoft.Storage",
          "Microsoft.Web",
          "Microsoft.EventHub",
          "Microsoft.Sql",
          "Microsoft.AzureCosmosDB"
          ],
          delegations = {}
      }
    }
    "snet-webapp-prod-cus-6401" = {
      cidrs = [cidrsubnet(data.azurerm_virtual_network.default.address_space[0],3,1)]
      service = { endpoints = [ ],
          delegations = {
            "Microsoft.Web/serverFarms" = {
            actions = ["Microsoft.Network/virtualNetworks/subnets/action"]
            name    = "Microsoft.Web/serverFarms"
            }
          }
      }
    }
    "snet-sqlmi-prod-cus-5951" = {
      cidrs = [cidrsubnet(data.azurerm_virtual_network.default.address_space[0],3,2)]
      service = { endpoints = [ ],
          delegations = {
            "Microsoft.Sql/managedinstances" = {
            actions = ["Microsoft.Network/virtualNetworks/subnets/action"]
            name    = "Microsoft.Sql/managedinstances"
            }
          }
      }
    }
  }
}

data "azurerm_virtual_network" "default" {
  name                = local.virtual_network_name
  resource_group_name = local.managed_resource_group_name
}


resource "azurerm_subnet" "default" {
  for_each             = local.subnets 
  name                 = local.subnets[each.key]
  address_prefixes     = local.subnets[each.key].cidrs  
  resource_group_name  = local.managed_resource_group_name
  virtual_network_name = data.azurerm_virtual_network.default.name
}



│     ├────────────────
│     │ each.key is "snet-sqlmi-prod-cus-5951"
│     │ local.subnets is object with 3 attributes
│ 
│ Inappropriate value for attribute "name": string required.
╵
╷
│ Error: Incorrect attribute value type
│ 
│   on resources.vnet.tf line 60, in resource "azurerm_subnet" "default":
│   60:   name                 = local.subnets[each.key]
│     ├────────────────
│     │ each.key is "snet-general-prod-cus-5315"
│     │ local.subnets is object with 3 attributes
│ 
│ Inappropriate value for attribute "name": string required.