We are trying to add a 'Add to Calendar' button on a marketing email that is based on the uniquely generated attendee link for a Teams Live Event. We are able to successfully take the generic link reserved for speakers and presenters and add this to the email, but then we lose the tracking/analytics around which attendee actually checked in or not. Does anyone have any insight? I have heard that Microsoft is adding an attachment feature in the May 2021 release, but I was not able to locate any documentation.