VPC (failing) Lambda RDS

main.tf

module "vpc" {
  source  = "cloudposse/vpc/aws"
  version = "2.1.0"

  ipv4_primary_cidr_block          = var.cidr_block    # cidr_block: '10.0.0.0/16'
  assign_generated_ipv6_cidr_block = false

  context = module.this.context
}

module "subnets" {
  source  = "cloudposse/dynamic-subnets/aws"
  version = "2.4.1"

  availability_zones = local.availability_zones        # availability_zones: ['us-east-1a', 'us-east-1b']
  vpc_id             = module.vpc.vpc_id
  igw_id             = [module.vpc.igw_id]
  ipv4_cidr_block    = [module.vpc.vpc_cidr_block]

  nat_gateway_enabled  = false
  nat_instance_enabled = true

  nat_instance_type = "t3a.nano"

  max_nats = 1

  context = module.this.context
}