Browser is not prompting for a client certificate

Question

Background:

I am updating an internal application to a two-step authentication process. I want to add a client certificate authentication process

Answer 1

Also, make sure Fiddler isn't getting in the way. If you have it decrypting the SSL, it'll corrupt the message back to IE, and it doesn't have the certificate installed, so it can't offer it. Turn off fiddler, and voila, the certificate prompt appears.