We use a smart card at work for all authentication, including our git repos in TFS.
git-credential-manager-for-windows worked just fine with this using either SourceTree or the git command line directly on windows 7.
We've just upgraded to windows 10 and not the credential manager prompts me for a username/password, but no option for a certificate from my smart card, like I would expect.
I'm poring over the documentation, but can't find anything wrong. Anyone have any ideas?