How to send invitation email when create event on calendar

Question

Hi, I use Microsoft graph calendar when Create event by C# coding not send invitation email to attends list .
How can I send invitation email automatic when add event

Answer 1

Hi @HR Info ,

Based on my test, this user-post-events API is successfully able to send mails to attendees after event is created.
Here is the example I used for my test.

GraphServiceClient graphClient = new GraphServiceClient( authProvider );  
  
var @event = new Event  
{  
	Subject = "Let's go for lunch",  
	Body = new ItemBody  
	{  
		ContentType = BodyType.Html,  
		Content = "Does noon work for you?"  
	},  
	Start = new DateTimeTimeZone  
	{  
		DateTime = "2017-04-15T12:00:00",  
		TimeZone = "Pacific Standard Time"  
	},  
	End = new DateTimeTimeZone  
	{  
		DateTime = "2017-04-15T14:00:00",  
		TimeZone = "Pacific Standard Time"  
	},  
	Location = new Location  
	{  
		DisplayName = "Harry's Bar"  
	},  
	Attendees = new List<Attendee>()  
	{  
		new Attendee  
		{  
			EmailAddress = new EmailAddress  
			{  
				Address = "samanthab@contoso.onmicrosoft.com",  
				Name = "Samantha Booth"  
			},  
			Type = AttendeeType.Required  
		}  
	}  
};  
  
await graphClient.Me.Events  
	.Request()  
	.Header("Prefer","outlook.timezone=\"Pacific Standard Time\"")  
	.AddAsync(@event);  

Please share any request body/API/snippet which you used.
Hope this helps.
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Answer 2

@SrinivasaRaoDarnaMSFT-7657
I use this Api and add successfully event on calendar but not sent invitation email

  public async Task<bool> AddEvent(string userEmail, string timeZone,
            string subject,
            DateTime start,
            DateTime end,
            List<string> attendees,
            string tenantId,
            string body = null)
        {
            IntializeAuth(tenantId);

            // Create a new Event object with required
            // values
            var newEvent = new Event
            {
                Subject = subject,
                Start = new DateTimeTimeZone
                {
                    DateTime = start.ToString("o"),
                    // Set to the user's time zone
                    TimeZone = timeZone
                },
                End = new DateTimeTimeZone
                {
                    DateTime = end.ToString("o"),
                    // Set to the user's time zone
                    TimeZone = timeZone
                },
                AllowNewTimeProposals = true
            };

            if (attendees.Count > 0)
            {
                var requiredAttendees = new List<Attendee>();

                foreach (var email in attendees)
                {
                    requiredAttendees.Add(new Attendee
                    {
                        Type = AttendeeType.Required,
                        EmailAddress = new EmailAddress
                        {
                            Address = email
                        }
                    });
                }

                newEvent.Attendees = requiredAttendees;
            }

           if (!string.IsNullOrEmpty(body))
            {
                newEvent.Body = new ItemBody
                {
                    Content = "body test",
                    ContentType = BodyType.Text
                };
           }
                await graphClient.Users[userEmail]
                    .Calendar
                    .Events
                    .Request()
                    .AddAsync(newEvent);

                return true;


        }

Answer 3

Hi,

I came across this thread having a similar issue. Our root cause was the API scope permissions that the user had. In addition to ability to create events in the calendar, the user also needed the Mail.Send scope. Once we applied this scope, the call worked including sending the notification mail to the invitees when the calendar event is created.

HTH

Mike