Hi, just for the sake of curiosity. Anyone know why the Parallels Client on Windows (without installing the SSO component) adds a Windows credentials provider on the login page? As you can see in the screenshot, after installing the Parallels client, on Windows login screen there are 2 password credentials providers.
Did you ever install the Client-side SSO component on the affected machine(s)? To me, this looks like incorrect behaviour in the Windows Installer. I think you should file an ticket with Parallels Support if you can.