I have followed the C# example described https://www.limilabs.com/blog/send-icalendar-meeting-requests
My issue is the iCalendar meeting request only goes to recipient address in the Mail.To() but all participants I have added using e.AddParticipant() are not receiving notification on their email.
Please assist.
You need to send the meeting request to all participants.
You may create separate emails for each one (containing same meeting request - Appointment), or send out a single message to all of them.