emptySubscription.json

{
    "$schema": "https://schema.management.azure.com/schemas/2019-08-01/managementGroupDeploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "subscriptionAliasName": {
            "type": "string",
            "metadata": {
                "description": "Provide a name for the alias. This name will also be the display name of the subscription."
            }
        },
        "billingAccountId": {
            "type": "string",
            "metadata": {
                "description": "Provide the full resourceId of the MCA or the enrollment account id used for subscription creation."
            }
        },
        "targetManagementGroup": {
            "type": "string",
            "metadata": {
                "description": "Provide the resourceId of the target management group to place the subscription."
            }
        }
    },
    "resources": [
        {
            "scope": "/", // routing the request to tenant root
            "name": "[parameters('subscriptionAliasName')]",
            "type": "Microsoft.Subscription/aliases",
            "apiVersion": "2020-09-01",
            "properties": {
                "workLoad": "Production",
                "displayName": "[parameters('subscriptionAliasName')]",
                "billingScope": "[parameters('billingAccountId')]",
                "managementGroupId": "[tenantResourceId('Microsoft.Management/managementGroups/', parameters('targetManagementGroup'))]"
            }
        }
    ],
    "outputs": {}
}