Nedbank makes use of cellular USSD and SMS OTP notifications. These are notifications presented to the user via their cellular network. It's important the user has cellular signal to receive these notifications.
This following forms are required from Nedbank,
Login - N/A
Payments - USSD or SMS OTP
Beneficiary Addition - USSD
The below is an example screenshot of what a typical Nedbank USSD may appear like.