Possible Reasons for Non-Delivered Campaigns and Messages
This error may occur due to one of these reasons:
• The recipient phone number is not a WhatsApp phone number
• Recipient Phone Number has blocked your business
• Recipient has not accepted WhatsApp's new Terms of Service and Privacy Policy.
• Recipient using an old WhatsApp version; must use the following WhatsApp version or greater:
◦ Android: 2.21.15.15 ◦ SMBA: 2.21.15.15 ◦ iOS: 2.21.170.4 ◦ SMBI: 2.21.170.4 ◦ KaiOS: 2.2130.10 ◦ Web: 2.2132.6
• The message was not delivered to create a high quality user experience.
WhatsApp imposes a max limit of marketing template messages that a contact can receive in a certain time across all businesses. You can read more about this here - Per-User Marketing Template Message Limits.
How to solve this?
Using a non-WhatsApp communication method, ask the WhatsApp user to:
• Confirm that they can actually send a message to your WhatsApp business phone number.
• Confirm that your WhatsApp business phone number is not in their list of blocked numbers (Settings > Privacy > Blocked or Blocked contacts).
• Confirm that they have accepted WhatsApp's latest Terms of Service (Settings > Help, or Settings > Application information will prompt them to accept the latest terms/policies if they haven't done so already)
• Update to the latest version of the WhatsApp client.