63003: Channel could not find To address

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.

• 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.

• 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.

• Twilio Messaging Channels
• Messages resource
• This error "Channel could not find To address" when Sending Programmable Messages to Channels