> For the complete documentation index, see [llms.txt](https://docs.lancepilot.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lancepilot.com/support/message-errors.md). # Message Errors
CodeDescriptionPossible SolutionsHTTP Status Code

131026

Message Undeliverable

Unable to deliver message. Reasons can include:

  • The recipient phone number is not a WhatsApp phone number.
  • Sending an authentication template to a WhatsApp user who has a +91 country calling code (India). Authentication templates currently cannot be sent to WhatsApp users in India.
  • Recipient has not accepted our 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. See Per-User Marketing Template Message Limits

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 they have accepted our 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.

400

Bad Request