For months now, the Windows 10 Anniversary Update has broken two-factor logins using certain smart cards – and Microsoft has refused to discuss it.
According to Reg readers writing in, and W10 users on support forums, folks who have Yubikey two-factor authentication gadgets have been hitting frustrating error messages when trying to log in with the latest flavor of Windows 10. Ideally, you plug your key into the USB port and type in your password, and together they authenticate you. For some, that stopped working.
In forum posts dating back all the way to September 2016, fed-up Microsoft customers have complained that when logging in locally to their machines with the smart cards, they get "Error 7" messages. The cards still work on earlier editions of Windows, and users running bleeding-edge Windows Insider builds say their cards now work.
Other users report speaking with Yubikey support staffers on this issue, only to be told the problem was on Microsoft's end – and that there was no timetable for it to be fixed.