1. User Guide
  2. Campaigns and Channels
  3. WhatsApp
  4. Troubleshooting and FAQs - WhatsApp
Why Do the Delivery Error Logs of Gupshup Display UNKNOWN_SUBSCRIBER?

Problem

The UNKNOWN_SUBSCRIBER error is a major factor that causes issues in WhatsApp campaigns.

Cause

  • The issue can be caused by various reasons, including:
    • The recipient's phone number is not registered on WhatsApp.
    • The recipient has not accepted the latest Terms of Service and Privacy Policy.
    • The recipient is using an outdated version of WhatsApp and did not update to the following versions or higher:
      • Android: 2.21.15.15
      • SMBA: 2.21.15.15
      • iOS: 2.21.170.4
      • SMBI: 2.21.170.4
      • KaiOS: 2.21.30.10
      • Web: 2.21.32.6
  • Delivery failure may also be due to Frequency Capping (FC), displayed as UNKNOWN_SUBSCRIBER by Meta.
arrow_drop_down How often does Meta engage in capping?
  • FC by Meta limits marketing messages sent to users in India.
  • It aims to reduce message overload and improve the ROI.
  • FC for marketing messages applies only to users in India (+91).
  • This limit only affects new marketing conversations, not ongoing ones.
  • The restriction does not apply to utility and authentication templates.

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