You can choose the required OTP Authentication method: Email, SMS, or Mobile APP for NetExtender login authentication if the administrator enables One-Time Password in Login Policies.
To enable a user to choose OTP authentication method for NetExtender login
Enable One-Time Password.
To configure the methods that users can choose to complete authentication, you can do one of the following:
If One-Time Password is enabled and the OTP methods are specified by the administrator, users can select any one of the OTP methods to complete authentication when connecting to the NetExtender.
If the User-discretion option is enabled by the administrator, user needs to enable One-Time Password and configure the required OTP authentication method(s).
Here’s an example of the authentication prompt displayed during NetExtender connection when all the OTP methods are selected: