What is Yubico OTP?

otp slotYubico OTP is a simple yet strong authentication mechanism that is supported by the YubiKey 5 Series and YubiKey FIPS Series out-of-the-box. Yubico OTP can be used as the second factorBy default, Yubico OTP is programmed into slot 1 on every YubiKey. That's why the Personalization Tool says slot 1 is programmed. Slot 2 is long press (~3 second press