Multi-session support is currently only available to a limited number of user accounts.

terraform {
 # S3 Conditional Writing configuration (locks without DynamoDB)
 required_version = "~> 1.10" # with use_lockfile
 backend "s3" {
  bucket     = "my-tf-state"
  # dynamodb_table = "my-tf-state-lock" # deprecated from 1.11
  use_lockfile  = true
  key      = "devops/us-east-1/kms.tfstate"
  region     = "us-east-1"
  encrypt    = "true"
  kms_key_id   = "arn:aws:kms:us-east-1:34567890:key/15a-6736"
 }
}

variable "regions" {
  description = "A list of regions."
  type        = set(string)
}

provider "aws" {
  alias    = "by_region"
  region   = each.value
  for_each = var.regions
}

module "deploy" {
  source    = "./deploy"
  providers = {
    aws = aws.by_region[each.key]
  }
}