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

Dynamic ID cannot be used as the first authentication method for Mobile Access due to its nature and the requirements of the authentication process. In many scenarios, a Dynamic ID is designed to function as a secondary authentication factor rather than the primary one.

For instance, typical first methods of authentication often rely on more static forms, such as username and password or certificate-based authentication. These methods provide a firm initial verification of the user's identity before any secondary mechanisms, like Dynamic ID—often implemented via one-time passwords or tokens—are employed to enhance security.

In contrast, RADIUS, username and password, and certificate-based mechanisms are standard first authentication methods that can effectively establish a secure initial connection for access control before further validation is applied.