AzurePolicyEnforceTags.json

{
  "properties": {
    "displayName": "Enforces a required tag and its value.",
    "description": "Enforces a required tag and its value on resources that supports tagging.",
    "mode": "indexed"
  },
  "policyRule": {
    "if": {
      "allOf": [
        {
          "not": {
            "field": "tags",
            "containsKey": "Application Name"
          }
        },
        {
          "not": {
            "field": "tags",
            "containsKey": "Business Unit Name"
          }
        },
        {
          "not": {
            "field": "tags",
            "containsKey": "Application ID"
          }
        },
        {
          "not": {
            "field": "tags",
            "containsKey": "Environment"
          }
        }
      ]
    },
    "then": {
      "effect": "deny"
    }
  }
}