An ARM template for deploying a User assigned managed identity

uai-deploy.json

{
    "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "identityName": {
            "type": "string",
            "defaultValue": "[concat('uai-', uniqueString(resourceGroup().id))]",
            "metadata": {
                "description": "The name of the identity resource"
            }
        }
    },
    "variables": {},
    "resources": [
        {
            "type": "Microsoft.ManagedIdentity/userAssignedIdentities",
            "name": "[parameters('identityName')]",
            "apiVersion": "2018-11-30",
            "location": "[resourceGroup().location]"
        }
    ],
    "outputs": {
        "identityClientId": {
            "type": "string",
            "value": "[reference(resourceID('Microsoft.ManagedIdentity/userAssignedIdentities/',parameters('identityName')), '2018-11-30').clientId]"
        }
    }
}