Subscribe to my on-call calendar You can subscribe to your on-call calendar using your personal calendar client. Before you begin Request your rota manager to send your on-call calendar subscription URL. This subscription URL is sent via an email notification. Ensure that your calendar client uses and supports the iCalendar format. Ensure that your calendar client provides the ability to subscribe to an external calendar. Attention: The end user must provide their instance credentials to authenticate themselves to use the subscription URL to view on-events. Currently, only the Calendar application on Mac OS X 8.0 onwards and the Outlook application on Windows 2013 onwards support authenticated calendar subscriptions. About this task Roles required: admin, rota_admin, itil, rota_manager Procedure On your calendar client, search for user assistance that assists you in navigating to the location where you can add a new external calendar subscription. Enter the subscription URL from the email notification you received earlier. Click Subscribe. Enter basic authentication details such as your login details for your ServiceNow® instance. Specify additional details such as how frequently the calendar is updated.