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Error 21709

Product: Programmable SMS

ERROR - 21709

Alpha Sender ID is Invalid or Not Authorized for this Messaging Service

The Alpha Sender ID being added to a Messaging Service is invalid or Alpha Sender IDs have not been enabled for this Messaging Service.

Possible Causes

  • The Messaging Service is not enabled to support Alpha Sender IDs.
  • The Alpha Sender ID being added to a Messaging Service is invalid. Alphanumeric Sender IDs may be up to 11 characters. Accepted characters include both upper- and lower-case ASCII letters, the digits 0 through 9, and space: A-Z, a-z, 0-9. They may not be only numbers.

Possible Solutions

  • Follow these steps to verify your Messaging Service is enabled to support Alpha Sender IDs. If it is not, please reach out to Support.
  • Verify the Alpha Sender ID you are trying to add to the Messaging Service is valid. View formatting requirements here.
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