# Message Errors

<table data-card-size="large" data-view="cards" data-full-width="false"><thead><tr><th>Code</th><th>Description</th><th>Possible Solutions</th><th>HTTP Status Code</th></tr></thead><tbody><tr><td><p><code>131026</code></p><p>Message Undeliverable</p></td><td><p></p><p>Unable to deliver message. Reasons can include:</p><ul><li>The recipient phone number is not a WhatsApp phone number.</li><li>Sending an <a href="https://developers.facebook.com/docs/whatsapp/business-management-api/authentication-templates">authentication template</a> to a WhatsApp user who has a +91 country calling code (India). Authentication templates currently cannot be sent to WhatsApp users in India.</li><li>Recipient has not accepted our new Terms of Service and Privacy Policy.</li><li><p>Recipient using an old WhatsApp version; must use the following WhatsApp version or greater:</p><ul><li>Android: 2.21.15.15</li><li>SMBA: 2.21.15.15</li><li>iOS: 2.21.170.4</li><li>SMBI: 2.21.170.4</li><li>KaiOS: 2.2130.10</li><li>Web: 2.2132.6</li></ul></li><li>The message was not delivered to create a high quality user experience. See <a href="https://developers.facebook.com/docs/whatsapp/cloud-api/guides/send-message-templates#per-user-marketing-template-message-limits">Per-User Marketing Template Message Limits</a></li></ul></td><td><p></p><p>Using a non-WhatsApp communication method, ask the WhatsApp user to:</p><ul><li>Confirm that they can actually send a message to your WhatsApp business phone number.</li><li>Confirm that they have accepted our latest Terms of Service (<strong>Settings</strong> > <strong>Help</strong>, or <strong>Settings</strong> > <strong>Application information</strong> will prompt them to accept the latest terms/policies if they haven't done so already)</li><li>Update to the latest version of the WhatsApp client.</li></ul></td><td><p><code>400</code></p><p>Bad Request</p></td></tr></tbody></table>


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.lancepilot.com/support/message-errors.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.