title: MFA Provider for ASP .NET Web Forms with Forms Authentication
body: <p>I'm looking for a good MFA provider to be incorporated to a legacy Web Forms application that uses Forms Authentication for security. It seems most of the MFA providers I see (such as Authy) are built around ASP .NET Identity. I'm trying to look for a solution that doesn't scratch the legacy application much... migrating the legacy application to ASP .NET Identity will be a nightmare. I've tried looking into Authy, Auth0, PingID and Okta and they all seem to be overkill for our use case. I'm trying to find an MFA provider that can work alongside Forms Authentication.</p>