Which detail cannot be added when creating a Subscriber?

When creating a Subscriber, the detail that cannot be added is the Alternative Mobile Number. In many email security and subscription management systems, the standard required fields typically involve the primary means of contact and identification, such as the Email Address, Full Name, and Preferred Language.

The Email Address is critical, as it serves as the unique identifier for each subscriber, allowing the system to send communications effectively. Full Name adds a personalized touch and helps in addressing the subscriber correctly in emails. Preferred Language is also an important detail, ensuring that the communications received by the subscriber are tailored to their language preference, improving engagement and understanding.

While an Alternative Mobile Number could be valuable for certain applications, it is often not a standard or mandatory field when initially setting up a Subscriber profile in email systems. Therefore, it does not conform to the essential data needed for subscriber registration in this context.