Update a OneNote page using Graph API

Question

I am trying to update a OneNote page using the PATCH request through the Microsoft Graph API. I keep getting Error 19999 which according to this https://msdn.microsoft.com/en-us/office/office365/howto/onenote-error-codes means "Unknown Error"

var pageId = settings.DefaultPage;
string requestUrl = $"https://graph.microsoft.com/v1.0/me/onenote/pages/{pageId}/content";
string body = @"{ 
{
'target':'body',
'action':'append',
'position':'after',
'content':'<div> added new </div>'}}";
var content = new StringContent(body, Encoding.UTF8, "application/json");
HttpRequestMessage req = new HttpRequestMessage()
{
    Method = new HttpMethod("PATCH"),
    Content = content,
    RequestUri = new Uri(requestUrl)
};
HttpClient client = new HttpClient()
{
    BaseAddress = new Uri(requestUrl),
};
client.DefaultRequestHeaders.TryAddWithoutValidation("authorization", "Bearer " + settings.MsaAccessCode);
HttpResponseMessage response = await client.SendAsync(req);

I can verify that the Authorization Code is valid (as I am able to do other actions like creating a new page) and has the necessary scopes to update a page. Can anyone help me with identifying the problem here?

Answer 1

Your JSON is invalid. Here is what I believe you want.

[{
    "target": "body",
    "action": "append",
    "position": "after",
    "content": "<div> added new </div>"
}]