I use Autologon.exe from sysinternals and this worked on my Windows 10 (Version 1511).
Autologon enables you to easily configure Windows’ built-in autologon mechanism. Instead of waiting for a user to enter their name and password, Windows uses the credentials you enter with Autologon, which are encrypted in the Registry, to log on the specified user automatically.
Autologon is easy enough to use. Just run autologon.exe, fill in the dialog, and hit
Enable
. To turn off auto-logon, hitDisable
.