How to open a System.Data.SQLClient.SQLConnection with Active Directory Universal Authentication
ActiveDirectoryInteractive authentication method is available since the .NET Framework 4.7.2. Not sure if it is the same as "Universal" or not.
As of August 2020, there's a better way to connect to Azure SQL DB's or Azure Synapse DW (SQL pools). By using the MSOLEDBSQL driver (which you may redistribute along with your application), your application can perform interactive/MFA authentication using the normal System.Data.OleDb objects:
using System.Data.OleDb;...OleDbConnection con = new OleDbConnection("Provider=MSOLEDBSQL;Data Source=sqlserver.database.windows.net;User ID=user@domain.com;Initial Catalog=database;Authentication=ActiveDirectoryInteractive");In fact, this is the recommended way of connecting to any Microsoft SQL product programatically, as both SQLOLEDB and SQLNCLI (aka. "SNAC") have been deprecated.