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Resolving Error 50407 "Invalid Messaging Binding Address" When Adding a WhatsApp Participant

Issue

You might receive error code 50407 when you attempt to add a WhatsApp participant to an existing Conversation. This error is usually given when the Participant messagingbinding.address parameter provided with the add Conversation Participant API request is not a valid participant address.

 

Product

Conversations Classic

 

Cause

Error code 50407 typically means Twilio is unable to validate the WhatsApp participant address for use in Conversations. Even if the number is in E.164 format, the following conditions must be met:

  • The WhatsApp sender (proxy address) must be a valid, approved WhatsApp sender on your Twilio account.
  • The participant number must be a valid WhatsApp user and reachable via WhatsApp.

Another reason why one might receive the 50407 error code when attempting to add a WhatsApp participant to a Twilio Conversation is because of the use of a phone number that starts with +1555. The 555 area code is not yet supported in Conversations and will result in the 50407 error code being thrown.

 

Resolution

Create a binding for the WhatsApp participant using a Twilio-approved WhatsApp number that does not use the 555 area code.

 

Additional Information

You can read more about error code 50407 at the following link:

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