---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/63003#article
headline: "63003: Channel could not find To address"
url: https://www.twilio.com/docs/api/errors/63003
inLanguage: en
dateModified: 2026-06-08T11:38:30.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 63003: Channel could not find To address

Log Type: APPLICATION

Log Level: ERROR

## Description

This error occurs when Twilio cannot validate the destination channel address in the `To` parameter for an outbound channel message. This usually means the address is incorrectly formatted, does not belong to an active user on the selected channel, or does not match the channel address you should use for the conversation.

### Possible causes

* The `To` value does not use the correct channel address format for the destination channel.
* The destination address is invalid for the selected channel, such as an unregistered WhatsApp number or an invalid Facebook Messenger user identifier.
* The `To` value was entered incorrectly.
* You are responding to a different channel address than the one that sent the inbound message.
* The destination user or device is inactive and cannot receive messages on that channel.

### Possible solutions

* Verify that the `To` value matches the required address format for the channel you are using. For example, use `whatsapp:+15558675310` for WhatsApp. Use `messenger:{messenger_user_id}` or `messenger:{messenger_page_id}` for Facebook Messenger.
* If the channel address contains a phone number, confirm that the number is correct and formatted in `E.164`.
* If you are replying to an inbound message, use the exact inbound `From` value as the outbound `To` value.
* Confirm that the destination user is still active on the channel and can receive direct messages in the channel application.
* Send a test message to another known-good recipient on the same channel to verify that your sender and channel configuration are working correctly.

#### Additional resources

* [Twilio Messaging Channels](/docs/messaging/channels)
* [Messages resource](/docs/messaging/api/message-resource)
* [This error "Channel could not find To address" when Sending Programmable Messages to Channels](https://help.twilio.com/articles/360038159493-Error-63003-Channel-could-not-find-To-address-when-Sending-Programmable-Messages-to-Channels)