Log in https://portal.azure.com/ with your account.

On the left menu select:

• Azure Active Directory
  • App Registrations
    • + New Registration
      • Name: terraform
      • Who Can use this application: Accounts in this organizational directory only (Default Directory only - Single tenant)
      • Register

Now on terraform:

• Certificates & Secrets
  • New client secret
    • Description: terraform
    • Add
  • Copy the value of the secret that would be on the right side ex: 8Z:s.?3pa@2zjuM4Y-JEoUdlj@w9SXfb

Now on subscriptions select your subscription.

• Access control (IAM)
  • Add a role assignment
    • Role: Contributor
    • Assign access to: Azure AD user, group, service principal
    • Select: terraform
    • Save

Now we need the following. client id, client secret, tenant and subscription

• Client ID we can get on app registrations/terraform: xxxxxxxx-xxxx-xxxx-xxxx-e684b975d113
• Client secret that we generate in Certificates & Secrets: 8Z:s.?3pa@2zjuM4Y-JEoUdlj@w9SXfb
• Tenant ID we can get on app registrations/terraform: xxxxxxxx-xxxx-xxxx-xxxx-9c8a75bbff3e
• Subscription id we can get on subscriptions: xxxxxxxx-xxxx-xxxx-xxxx-62f9d45b6957

• https://www.terraform.io/docs/providers/azurerm/index.html
• https://www.terraform.io/docs/providers/azurerm/guides/service_principal_client_secret.html