yubikey piv slots: YubiKey - Wikipedia. Amazon.com: USB Flash Drive Case, Thumb Drive, Memory Card SD ... . What is a YubiKey and how does it work? | Zapier.
Remote ssh-server can't verify my private key from YubiKey after thirty ~ fourty five minutes ssh-agent inactivity. I use YubiKey 5C Nano under MacOS 11.5.2 (Apple M1) with lib from yubico-piv-tool...
{ "root": "/etc/step-ca/certs/root_ca.crt", "federatedRoots": [], "crt": "/etc/step-ca/certs/intermediate_ca.crt", "key": "yubikey:
slot-id=9c", "kms": { "type": "yubikey", "pin": "123456" }, "address": ":443", ...
If the YubiKey has an empty slot available, the command will select the empty slot automatically.