Flag Completed

Am trying to set Flag for mails

FollowUpOptions option = new FollowUpOptions(“Follow up”,
StartDate.Date,DueDate.Date, ReminderDate);

FollowUpManager.SetOptions(f_mapimessage, option);

I can see one flagCompleted property but it is read only.
How can i make this flag as completed ?

@Shital_diwate,

We have tested this at our end and are not able to reproduce the issue with the latest version of the API. The message is marked for follow-up once it is sent and we are able to mark it as complete from the Sent Items folder. Please try it with this lates version of API and if the issue still persists, please list the steps for us in order to reproduce the same at our end.