ICal plugin tracking option not available

We are using ICal plug in to send meeting invites to outlook calendar. We are facing an issue while using this plug in. In outlook meeting invites, there is an option called tracking which shows the status of the user acknowledgement whether the invites are accepted by the user or not. But while sending meeting invites through ICal plug in, tracking option is not available in invites and the organizer is not able to track. Any advice on how to enable tracking or any other possible solution to achieve this?

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