acquiretokenasync not working in a web app - azure

Question

I am trying to use the following overload :
authContext.AcquireTokenAsync(, )
This works fine with a simple console app and I am able to retrieve the token.
But when I run this from a web application, the call doesn't return and no exception is thrown. I checked in fiddler and it seems the connection closes on this call.
How to get this resolved? Is it related to HttpContext having restricted permissions?

Answer 1

Its probably because of the async/await, for my code I just added await before the graphClient.Users[FromUserEmail].SendMail(message, true).
This works:
var sendmail = graphClient.Users[FromUserEmail].SendMail(message, true);
Task.Run(async () =>
{
try
{
await sendmail.Request().PostAsync();
}
catch (Exception ex)
{
throw ex;
}
}).Wait();

Answer 2

Normally, we acquire the token using authorization code grant flow in a web application. To achieve the goal, we need to implement OnAuthorizationCodeReceived event like below(full code sample):
private async Task OnAuthorizationCodeReceived(AuthorizationCodeReceivedNotification context)
{
var code = context.Code;
ClientCredential credential = new ClientCredential(clientId, appKey);
string userObjectID = context.AuthenticationTicket.Identity.FindFirst("http://schemas.microsoft.com/identity/claims/objectidentifier").Value;
AuthenticationContext authContext = new AuthenticationContext(Authority, new NaiveSessionCache(userObjectID));
// If you create the redirectUri this way, it will contain a trailing slash.
// Make sure you've registered the same exact Uri in the Azure Portal (including the slash).
Uri uri = new Uri(HttpContext.Current.Request.Url.GetLeftPart(UriPartial.Path));
AuthenticationResult result = await authContext.AcquireTokenByAuthorizationCodeAsync(code, uri, credential, graphResourceId);
}
If you want to implement the client credentials flow, you can refer code below:
string authority = "https://login.microsoftonline.com/{tenantId}";
string clientId = "{clientId}";
string secret = "{secret}";
string resource = "https://graph.windows.net";
var credential = new ClientCredential(clientId, secret);
AuthenticationContext authContext = new AuthenticationContext(authority);
var token = authContext.AcquireTokenAsync(resource, credential).Result.AccessToken;
If you still have the problem, it is helpful to share the detail code.

Answer 3

it's just a common mistakes that developper makes regarding asyn/await
you have just to add async Task<> to your method and of course the await keyword near to the call of methode that retreive the token