How to Show Your Opta Calendar Events on Third Party Calendars
Log into Symbient Opta and click on the menu options: My Stuff > Calendar.
Click the "Subscribe to Calendar" button at the top-left. This will copy a URL to your clipboard.
Follow the instructions for your third party calendar app to use this link as your subscription URL
Note: When subscribing a third party calendar app to your Opta calendar, make sure to select iCalendar (ICS) for the format.