CSOM C# with Multi Factor Authentication

Question

Hi,
I have an application (webservice c#) to communicate with SP Online Tenant to fetch all site collections. All was working fine until client enable multi factor authentication.

How we can fetch all site collection from tenant having multi factor authentication enabled.

Answer 1

Hi @Amit Singh Rawat ,

Using class SharePointOnlineCredentials with userName and password to authenticate in SharePoint does not support for MFA enviroment.

As a workaround, you could install the package SharePointPnPCoreOnline: https://www.nuget.org/packages/SharePointPnPCoreOnline. And use the below way to get clientcontex.

   string siteUrl = "https://<tenant-name>.sharepoint.com/sites/test";    
   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);    

Another workaround is using App Only autentication: https://www.c-sharpcorner.com/article/connect-to-sharepoint-online-site-with-app-only-authentication/

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Answer 2

Hi @Amit Singh Rawat ,

Then you could create app password for the account, use the app password to authenticate. Read this article for more: https://learn.microsoft.com/en-us/azure/active-directory/user-help/multi-factor-authentication-end-user-app-passwords