I am working on a scripts for creating a site hierarchy in Cisco DNA/Catalyst Center. I have structure that looks like this:

├── main.tf
├── variables.tf
├── modules 
│ └── site_settings 
│   └── ip-pools.tf 
│   └── variables.tf
├── Site-1
│ └── site-1.tfvars

In ./main.tf I have:

provider "dnacenter" {

    base_url = var.dnac_url
    debug = "true"
    ssl_verify = "false"
}

module "site_settings" {
  # Using m0_general_settings module to configure general settings
  source = "../modules/site_settings"

  ip_pools = var.ip_pools
}

The ./modules/site_settings/ip-pools.tf has:

resource "dnacenter_reserve_ip_subpool" "pool" {
  for_each = { for pool in var.ip_pools : pool.name => pool }
  provider = dnacenter
  parameters {
    ipv4_dhcp_servers  = "${each.value.dhcp_server_ips}"
    ipv4_dns_servers   = "${each.value.dns_server_ips}"
    ipv4_gate_way      = "${each.value.ipv4_gate_way}"
    ipv4_global_pool   = "${each.value.ipv4_global_pool}"
    ipv4_prefix        = "true"
    ipv4_prefix_length = "${each.value.ipv4_prefix_length}"
    ipv4_subnet        = "${each.value.subnet_id}"
    ipv6_address_space = "false"
    name               = "${each.value.name}"
    site_id            = dnacenter_area.site.item.0.id
    type               = each.value.type
  }
}

These are the varialbe values in ./site-1.tfvars :

ip_pools = [{
subnet_id = "10.0.4.0"
ipv4_prefix_length = "24"
name = "Site-1-USER"
reso_code = "Site-1"
ipv4_gate_way = "10.0.4.1"
type = "General"
dns_server_ips = ["10.10.1.30" , "10.10.1.31"]
dhcp_server_ips = ["10.10.10.112" , "10.10.10.116" , "10.10.11.112" , "10.10.11.116"]
ipv4_global_pool = "10.0.0.0/16" 
}]

These are the variables defined in ./variables.tf

variable "dnac_username" {
    sensitive = true
}
variable "dnac_password" {
    sensitive = true
}
variable "dnac_url" {
  type = string
}
variable "ip_pools" {
  type = list(object({
    name = string
    subnet_id = string
    type = string
    dhcp_server_ips = list(string)
    dns_server_ips = list(string)
    ipv4_gate_way = string
    ipv4_global_pool = string
    ipv4_prefix_length = string
    }))
}

And in the ./modules/site_settings/variables.tf vars I have:

variable "ip_pools" {}

When I try to run the plan command, it looks fine… I think:

# module.site_settings.dnacenter_reserve_ip_subpool.pool["Site-1-USER"] will be created
  + resource "dnacenter_reserve_ip_subpool" "pool" {
      + id           = (known after apply)
      + item         = (known after apply)
      + last_updated = (known after apply)

      + parameters {
          + ipv4_dhcp_servers  = [
              + "10.10.10.112",
              + "10.10.10.116",
              + "10.10.11.112",
              + "10.10.11.116",
            ]
          + ipv4_dns_servers   = [
              + "10.10.1.30",
              + "10.10.1.31",
            ]
          + ipv4_gate_way      = "10.0.4.1"
          + ipv4_global_pool   = "10.0.0.0/16"
          + ipv4_prefix        = "true"
          + ipv4_prefix_length = 24
          + ipv4_subnet        = "10.0.4.0"
          + ipv4_total_host    = (known after apply)
          + ipv6_address_space = "false"
          + ipv6_dhcp_servers  = (known after apply)
          + ipv6_dns_servers   = (known after apply)
          + ipv6_gate_way      = (known after apply)
          + ipv6_global_pool   = (known after apply)
          + ipv6_prefix        = (known after apply)
          + ipv6_prefix_length = (known after apply)
          + ipv6_subnet        = (known after apply)
          + ipv6_total_host    = (known after apply)
          + name               = "Site-1-USER"
          + site_id            = "61c4c037-ab4a-xxxx-xxxx-xxxxxxxxxxx"
          + slaac_support      = (known after apply)
          + type               = "General"
        }
    }

However when I try to apply, I get this error which is not very descriptive:

Error: Failure when executing ReserveIPSubpool
│ 
│   with module.site_settings.dnacenter_reserve_ip_subpool.pool["Site-1-USER"],
│   on modules/site_settings/ip-pools.tf line 16, in resource "dnacenter_reserve_ip_subpool" "pool":
│   16: resource "dnacenter_reserve_ip_subpool" "pool" {
│ 

What do you think might be wrong here? Or how can I do a debug or get some more meaningful output what the issue is?
Thanks!