21707: Short Code SID is required to associate to a Messaging Service.Positive FeedbackNegative FeedbackERROR: 21707error-21707 page anchorPositive FeedbackNegative FeedbackERROR Descriptiondescription page anchorPositive FeedbackNegative FeedbackYou attempted to add a short code to your Service, but you forgot to include the SID of the short code you would like to add.