Which type of authentication on Mobile Access can NOT be used as the first authentication method?

Dynamic ID authentication is not suitable as the first authentication method in Mobile Access due to its reliance on a secondary factor that typically requires a prior layer of authentication to be established. Dynamic ID methods, such as those that use One-Time Passwords (OTPs), are generally designed to complement another form of authentication rather than serve as the initial authentication step.

The primary forms of authentication, like RADIUS, Username and Password, and Certificates, are structured to be the foundational entry points, providing a base level of authentication before any subsequent verification, such as Dynamic ID, is conducted. This ensures that the access control process is both secure and reliable, with a well-defined flow from initial access request to final authentication verification.