# Message Errors

Code

`131026`

Message Undeliverable

Description

Unable to deliver message. Reasons can include:

* The recipient phone number is not a WhatsApp phone number.
* Sending an [authentication template](https://developers.facebook.com/docs/whatsapp/business-management-api/authentication-templates) 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](https://developers.facebook.com/docs/whatsapp/cloud-api/guides/send-message-templates#per-user-marketing-template-message-limits)

Possible Solutions

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.

HTTP Status Code

`400`

Bad Request