21710: Phone Number Already Exists in Messaging Service

This warning occurs when you try to add a phone number, short code, or alpha sender ID that's already associated with the same Messaging Service Sender Pool.

• You sent multiple requests to add the same phone number, short code, or alpha sender ID to the Messaging Service.
• The sender was already added to the Messaging Service at an earlier time.
• Your application retried a previous add request after the sender was already associated with the Service.

• If the sender is already associated with the correct Messaging Service, no action is required.
• Check the Messaging Service Sender Pool before retrying the add request.
• If the sender should be recreated, remove the existing phone number, short code, or alpha sender ID from the Messaging Service and then add the sender again.
• Update your application logic to avoid sending duplicate create requests for the same sender.

• Services PhoneNumbers subresource
• ShortCodes subresource
• AlphaSenders subresource