How to do Multi-factor authentication with SharePoint-Online using CSOM

Question

Using just a password-based authentication, it's easy to authenticate in CSOM:

context.Credentials = new SharePointOnlineCredentials(username, password);

But how to authenticate when Multi-factor authentication is in place (http://technet.microsoft.com/en-us/library/dn249471.aspx)?

Answer 1

Use an app password in place of your normal one.

Generate an app password here:

https://account.activedirectory.windowsazure.com/AppPasswords.aspx

Or go to

https://portal.office.com/account/#security

and click Additional Security Verification > Create app password.

You can always revoke/delete the app password later.