We have created a Service Account in Google and Using Calendar API for adding events, it worked fine before ,after google stopped the account and reactivated it , it didn\'t
remember that the following code inserts your events into the service accounts primary calendar
var recurringEvent = service.Events.Insert(myEvent, "primary");
In order to see these events you will need to either do an events.list or invite someone else to the event so that they can see it in their own calendar.
Beyond that there is currently an issue on the forums about invites not being sent https://issuetracker.google.com/issues/140746812