Knowledge Base Frequently Asked Questions General Support Questions Search How can I back up my YubiKey? My YubiKey is not working. What should I do? How do I remove a configuration protection access code? How can I swap Yubico OTP from Slot 1 to Slot 2? How do I stop triggering OTP codes accidentally with my nano-sized YubiKey? What are the core static password features? My YubiKey NEO is not being detected by my NFC-capable device. What should I do? Can the YubiKey 4C be plugged directly into Android phones or tablets with USB-C ports? How many credentials can I store with Yubico Authenticator? Why do I have to enter only numeric PINS for the PIV Manager on macOS Sierra? Do I still need to authenticate and unlock my disk using my FileVault password using YubiKey on macOS Sierra. How do I log in to another macOS Sierra account, for example, if I have a multi-user system? When I try to register a YubiKey with the YubiKey for Windows Hello app, why do I receive an error? How do I use a YubiKey with USB-C adapters? What modes can I use with the NDEF interface of the YubiKey NEO? What is the default NDEF4 tag of the YubiKey NEO? Is my device compatible with the YubiKey? What happens if I don’t have my YubiKey with me? Does the YubiKey work with USB 3 Ports? How can I check the firmware version of a YubiKey? Is it possible to upgrade the YubiKey firmware? What can I do with my YubiKey? Why does the YubiKey act as a keyboard? How many credentials can I program on my YubiKey?