Unable to create mail folder using Graph API C#

Question

Using Graph API in C#, we are trying to create a child folder inside Inbox folder for a user's email.

Following is the code snippet for the same:

var newMailFolder = new MailFolder
{
     DisplayName = mailboxName,
     IsHidden = false
};

mailFolder = _gsc.Users[_outlookUser.Id].MailFolders["inbox"].ChildFolders.Request().AddAsync(mailFolder).Result;

This always throws the following exception:

Write requests (excluding DELETE) must contain the Content-Type header declaration

Can someone please help ASAP?

Answer 1

Maybe replace AddAsync(mailFolder) with AddAsync(newMailFolder).