ClientContext giving 403 Forbidden error

I am hosting my site in Azure

Azure and Office 365 have same account detail. But when I am using the following code it’s giving 403 error.

Also while accessing Azure site I already logged in Office 365 then also not able to take ClientContext. As I am aware i’ts SSO by Azure & Office 365.

 try  {      var siteUrl = "https://Office365Site";      using (var clientContext = new ClientContext(siteUrl))      {          clientContext.Load(clientContext.Web, web => web.Title);          clientContext.ExecuteQuery();          Response.Write(clientContext.Web.Title);       }  }  catch (Exception ex)  {      Response.Write(ex.Message);  } 

Please help in this issue.