[Azure] The subscription is not registered to use namespace ‘Microsoft.ContainerService’

azurerm_kubernetes_cluster.aks_cluster: Creating...
╷
│ Error: creating Kubernetes Cluster (Subscription: "7f8e5acb-a937-4163-80b1-f874c3a4d62c"
│ Resource Group Name: "nimtechnology"
│ Kubernetes Cluster Name: "terraform-aks-elearning-cluster"): performing CreateOrUpdate: unexpected status 409 (409 Conflict) with error: MissingSubscriptionRegistration: The subscription is not registered to use namespace 'Microsoft.ContainerService'. See https://aka.ms/rps-not-found for how to register subscriptions.
│ 
│   with azurerm_kubernetes_cluster.aks_cluster,
│   on c7-azure.tf line 1, in resource "azurerm_kubernetes_cluster" "aks_cluster":
│    1: resource "azurerm_kubernetes_cluster" "aks_cluster" {
│ 
╵

You need to register the Microsoft.ContainerService provider for your subscription.You can do this via the Azure CLI, Azure Portal, or PowerShell.

Option 1: Azure CLI (Recommended)

az provider register --namespace Microsoft.ContainerService

You can check the registration status with:

az provider show --namespace Microsoft.ContainerService --query "registrationState"

Option 2: Azure Portal

1. Go to the Azure Portal.
2. Search for Subscriptions and select your subscription.

3. In the left menu, click Resource providers.