Microsoft Graph API - "code": "UnknownError"

Question

Does anyone know what to do when you get "UnknownError" from Graph API?

Request: https://graph.microsoft.com/v1.0/users/[USER_ID]/messages?$select=id,receivedDateTime&$filter=receivedDateTime+ge+2016-09-13+and+receivedDateTime+lt+2019-09-14&$orderby=receivedDateTime+asc&$skip=25651&$top=1

Response:

{
  "error": {
    "code": "UnknownError",
    "message": "",
    "innerError": {
      "request-id": "1ea27a29-5491-44d2-824a-0aaee9280c40",
      "date": "2019-09-13T19:48:30"
    }
  }
}

Answer 1

I'm having the same error on another part of the Graph API. I'm lead to believe it's a permissions error, easiest way to test would most likely be to use the Graph Explorer.

https://developer.microsoft.com/en-us/graph/graph-explorer

Run the request there and assign yourself the relevant permissions.

If this doesn't work then the relevant place to raise this issue seems to be on the Graph API GitHub which is here https://github.com/microsoftgraph/microsoft-graph-docs

Answer 2

The HTTP error code would give you much more detail about what went wrong. If it's a 403 or 401, then it's an auth error. If it's 500, or 503, then it's a server error.

Answer 3

I am getting the error more often now, on an application that retrieves file and folder stucture. My workaround is to detect the error, wait a little and retry.

IDriveItemChildrenCollectionPage folderitems = null;
            bool done = false;
            Int16 tries = 0;
            while (!done && tries < 3)
            {

                try
                {

                    DriveItem folderitem = null;
                    if (folder.Equals(""))
                        folderitem = SPclient.Sites[siteId].Lists[listId].Drive.Root.Request().GetAsync().Result;
                    else
                        folderitem = SPclient.Sites[siteId].Lists[listId].Drive.Root.ItemWithPath(folder).Request().GetAsync().Result;
                    folderitems = SPclient.Sites[siteId].Lists[listId].Drive.Items[folderitem.Id].Children.Request().GetAsync().Result;
                done = true;
                }
                catch (Exception ex)
                {
                    if (ex.InnerException != null && ex.InnerException.Message.StartsWith("Code: UnknownError"))
                    {
                        //wait, retry
                        System.Threading.Thread.Sleep(500);
                    }
                    else
                        throw;
                }
                finally
                {
                    tries++;
                }
            }