Hi there,
- Try plugging in the smart card reader into another computer and see if the card reader still won't work.
- Delete current Smart card driver and reinstall it.
- Try to modify it using Local Group Policy Editor:
gpedit.smc (Run As Admin) / Computer Configuration / Administrative Templates / Windows Components /Smart Card
and enable feature: Turn on certificate propagation from smart card
- If their are any recent updates try uninstalling them and then check if you can login.
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