Microsoft Graph API, sending email response: StatusCode: 401 ReasonPhrase: 'Unauthorized'

Question

I am trying to send an email using the Microsoft Graph API, and getting the following response:

StatusCode: 401, ReasonPhrase: 'Unauthorized'...

I'm trying to find out if there's something wrong with my code, or if the user account is lacking permissions.

Here is the code below:

string accessToken = GetADToken();
string graphRequest = "https://graph.microsoft.com/v1.0/me/sendMail";

HttpClient client = new HttpClient();
client.DefaultRequestHeaders.Authorization =
    new AuthenticationHeaderValue("Bearer", accessToken);
client.DefaultRequestHeaders.Accept
    .Add(new MediaTypeWithQualityHeaderValue("application/json"));

var email = new {
    message = new {
    subject = "test subject",
    body = new {
    contentType = "Text",
    content = "The cafeteria is open"
    },
    toRecepients = new List<object> {
    new {
    emailAddress = new {
    address = "[email protected]"
    }
    }
    },
    ccRecipients = new List<object> {
    new {
    emailAddress = new {
    address = "[email protected]"
    }
    }
    }
    },
    saveToSentItems = false
};

string requestContent = JsonConvert.SerializeObject(email);
var buffer = Encoding.UTF8.GetBytes(requestContent);
var byteContent = new ByteArrayContent(buffer);
byteContent.Headers.ContentType = new System.Net
    .Http.Headers.MediaTypeHeaderValue("application/json");

var response = client.PostAsync(graphRequest, byteContent).Result;

return response;

I would appreciate some help getting my code to send emails through the graph api

Which scopes have you requested? Also, please include the value of accessToken. This will shed light on which permission scopes are actually getting applied. — Marc LaFleur

Seiya Su Seiya Su · Accepted Answer · 2018-09-06T03:42:51

If you are using the MVC, you can check the scope in the following code(Web.Config file)

  <add key="ida:GraphScopes" value="Mail.Send"/>

If you are using the NETCore, you can check the scope in the following code(appsettings.json)

 "GraphScopes": "Mail.Send"

We suggest you start the mail send sample:https://github.com/microsoftgraph/aspnet-connect-rest-sample

Microsoft Graph API, sending email response: StatusCode: 401 ReasonPhrase: 'Unauthorized'

1 Answers