otp slotBy 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 pressCommits a confuration to one of two programmable slots. Slot 1 corresponds to the short press of the YubiKey button, and Slot 2 the long press.