Using multiple provider version in terraform - terraform

Question

Im trying to use two provider version with in terraform, though Im getting the below error
Error: Failed to query available provider packages
Could not retrieve the list of available versions for provider hashicorp/aws:
no available releases match the given constraints >= 3.71.0, 3.71.0, 4.6.0
Here is what Im trying to do. I have a terraform file, which uses multiple module. And in one module alone, I need to use aws provider version 4.6.0. On other modules, I need to stick to currently applied provider version, which is 3.71.0
Terraform version: 0.13.6
Im defining a constraint in terraform file, so "hashicorp/aws" can be anything above 3.71.0. Below is what is defined:
"aws": {
"version": ">= 3.71.0",
"assume_role": {
"role_arn": "....",
"session_name": "..."
},
terraform file calls more than 10 module, and module 0 to 9 provider config is
terraform {
required_providers {
aws = {
source = "hashicorp/aws"
version = "= 3.71.0"
}
}
}
and 10th module provider config is
terraform {
required_providers {
aws = {
source = "hashicorp/aws"
version = "= 4.6.0"
}
}
}
Anything Im missing?
Note : I have already referred this post - Multiple provider versions with Terraform, though not sure, if its technically not possible, and something Im doing it wrong

Answer 1

We use a separate provider block for each and every region, this is how we handle it:
provider "aws" {
region = "us-west-2"
}
provider "aws" {
alias = "east-2-provider"
region = "us-east-2"
version = "~> 4.0"
}
provider "aws" {
alias = "east-1-provider"
region = "us-east-1"
version = "~> 3.74"
}
When we are using a module we use it as below:
module "example-1" {
source = "./example"
providers = {
aws = east-1-provider
}
}
module "example-2" {
source = "./example"
providers = {
aws = east-2-provider
}
}