SharePoint Online Authentication: The identity has not been authenticated.

Question

string siteCollectionUrl = "https://tenant.sharepoint.com/";        
string userName = "user@companyname.onmicrosoft.com";        
string password = "XXXXXX";        
    
// Namespace: Microsoft.SharePoint.Client        
ClientContext ctx = new ClientContext(siteCollectionUrl);       
    
// Namespace: System.Security      
SecureString secureString = new SecureString();         
password.ToList().ForEach(secureString.AppendChar);        
    
// Namespace: Microsoft.SharePoint.Client        
ctx.Credentials = new SharePointOnlineCredentials(userName, secureString);       
    
// Namespace: Microsoft.SharePoint.Client        
Site site = ctx.Site;       
    
ctx.Load(site);        
ctx.ExecuteQuery();     

Answer 1

Hi @Ariel M ,

To help you better, can you share more information on this issue so that I can reproduce the issue? I was able to use the code you provided successfully without any errors.

If you want to connect to SharePoint Online using CSOM, you can use the following code:

 class Program  
    {  
        private class Configuration  
        {  
            public static string ServiceSiteUrl = "https://xxxxx.sharepoint.com/sites/xxx";  
            public static string ServiceUserName = "xxxx@xxxx.onmicrosoft.com";  
            public static string ServicePassword = "xxxxxx";  
        }  
  
        static ClientContext GetonlineContext()  
        {  
            var securePassword = new SecureString();  
            foreach (char c in Configuration.ServicePassword)  
            {  
                securePassword.AppendChar(c);  
            }  
            var onlineCredentials = new SharePointOnlineCredentials(Configuration.ServiceUserName, securePassword);  
            var context = new ClientContext(Configuration.ServiceSiteUrl);  
            context.Credentials = onlineCredentials;  
            return context;  
        }  
  
        static void Main(string[] args)  
        {  
            var ClientContext = GetonlineContext();  
            Web web = ClientContext.Web;  
            ClientContext.Load(web);  
            ClientContext.ExecuteQuery();  
            Debug.WriteLine(web.Title);  
        }  
       
    }  

If you want to connect to a SharePoint site with MFA using CSOM, you can use the following code:

static void Main(string[] args)   
{   
   string siteUrl = "https://< Jump tenant-name>.sharepoint.com/sites/contosoteam";   
   var authManager = new OfficeDevPnP.Core.AuthenticationManager();   
   // This method calls a pop up window with the login page and it also prompts   
   // for the multi factor authentication code.   
   ClientContext ctx = authManager.GetWebLoginClientContext(siteUrl);   
   // The obtained ClientContext object can be used to connect to the SharePoint site.   
   Web web = ctx.Web;   
   ctx.Load(web, w => w.Title);   
   ctx.ExecuteQuery();   
   Console.WriteLine("You have connected to {0} site, with Multi Factor Authentication enabled!!", web.Title);   
}  

More information for reference: Sharepoint: Connect to site with MFA enabled using CSOM and PnP PowerShell

Hope it can help you. Thanks for your understanding.

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