Cannot create an event using application for a user.

Question

I have a simple graph request to create an event using c# for any user. I have full application permissions on the calendar. I can create emails and SharePoint items so I know the GraphClient is correct. The strange thing is the try catch will not catch the error so I am not sure what the error is. Is there a know issue creating an event using application permissions? The docs say it is supported. I tried multiple Office 365 email accounts.

ApplicationCalendars.ReadWriteApplicationCalendars.ReadWrite var simplerequestBody = new Event

            {

                Subject = "My event",

                Start = new DateTimeTimeZone

                {

                    DateTime = "2024-08-07T21:04:11.549Z",

                    TimeZone = "Pacific Standard Time",

                },

                End = new DateTimeTimeZone

                {

                    DateTime = "2024-08-14T21:04:11.549Z",

                    TimeZone = "Pacific Standard Time",

                },

            };

            try

            {

                var apptresult = await GraphClient.Users["[user email]"].Events.PostAsync(simplerequestBody);

            }

            catch (Exception ex)

            {

                var errorme = ex.Message;

            }

Answer 1

Hi @SalesOutlook

I just tested this API locally, and it works well. I can use the client credentials flow to create events for other users. Please note that your MS 365 user must have an MS 365 license.

Additionally, I recommend using the OdataError class to catch exceptions.

try
{

var requestBody = new Event
{
	Subject = "Let's go for lunch",
	Start = new DateTimeTimeZone
	{
		DateTime = "2024-08-15T12:00:00",
		TimeZone = "Pacific Standard Time",
	},
	End = new DateTimeTimeZone
	{
		DateTime = "2024-08-15T14:00:00",
		TimeZone = "Pacific Standard Time",
	},
};

var result = await graphClient.Users["{user-id}"].Events.PostAsync(requestBody);

}
catch (ODataError odataError)
{
    Console.WriteLine(odataError.Error.Code);
    Console.WriteLine(odataError.Error.Message);
   
}

Hope this helps.

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Answer 2

It eventually creates the appointment. We do not get a value for apptresult to know if it actually worked. And we cannot continue to process unless we know it worked. I will accept answer but it sure is strange behaviour.