3640
MySQLERRORNotableAccess ControlHIGH confidence
FIDO device not found
Production Risk
High — Authentication fails when device is unavailable; fallback mechanism needed for hardware failure scenarios.
How to reproduce
trigger — this will error
trigger — this will error
-- FIDO2 authentication attempted without device connected
expected output
ERROR 3640 (HY000): FIDO device not found.
Fix
Connect FIDO2 device before authenticating
Connect FIDO2 device before authenticating
-- Plug in USB FIDO2 key, verify OS detection, then retry connection
Why this works
Ensures the hardware authenticator is available for the authentication ceremony.
What not to do
✕
Version notes
Sources
Official documentation ↗
MySQL 8.0 — 3640 ER_FIDO_DEVICE_NOT_FOUND
Content generated with AI assistance and reviewed for accuracy. Found an error? hello@errcodes.dev