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SCARD_E_READER_UNSUPPORTED
SCARD_E_READER_UNSUPPORTED The reader driver does not provide the minimum functionality expected by the Windows smart-card stack. This is a reader-driver compatibility issue, not a certificate or domain-authentication error.
What to verify
- Identify the actual reader driver and its supported Windows version, not just the USB device model.
- Test with the issuer's supported reader driver or a known compatible reader.
- Do not install arbitrary third-party middleware to mask a driver incompatibility; it can create conflicting reader registrations.
Microsoft: Smart Card Plug and Play
Microsoft: Smart Card Minidrivers
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