Which 2FA/MFA options can be used if users cannot use their mobile device?

If users cannot use their mobile device for two-factor authentication (2FA) or multi-factor authentication (MFA), they can use other methods such as FIDO2 keys, which are external security keys that provide a strong form of hardware-based authentication. Additionally, security questions can serve as a knowledge-based authentication factor, which is something the user knows. These options are part of the broad set of supported factors provided by CyberArk for secure authentication. References: The information is based on the CyberArk documentation which details the various MFA options available, including FIDO2 keys and security questions as alternative methods when mobile devices are not usable12.