Querying AWS Availability Zones with Filter

Terraform
1

I am trying to query the AWS availability zones, but wish to filter the zones based on region hence modified data block:

locals {
  cluster_name = var.my_cluster_name
  aws_region   = var.my_cluster_region
}

data "aws_availability_zones" "available_zones" {
  state = "available"
  filter {
    name   = "region-name"
    values = ["${local.aws_region}"]
  }
}

When I try to use the same with vpc block:

module "vpc" {
  source  = "terraform-aws-modules/vpc/aws"
  version = "3.5.0"

  name                 = var.gloo_vpc_name
  cidr                 = "10.0.0.0/16"
  azs = data.aws_availability_zones.available_zones.names
...
}

I get the series of errors like,

│
│   on .terraform/modules/gloo-cluster.vpc/main.tf line 1075, in resource "aws_eip" "nat":
│ 1075:         element(var.azs, var.single_nat_gateway ? 0 : count.index),
│     ├────────────────
│     │ count.index is 0
│     │ var.azs is empty list of string
│     │ var.single_nat_gateway is true
│
│ Call to function "element" failed: cannot use element function with an empty list.

Is there anything wrong with my filter ?