21710: Phone Number Already Exists in Messaging Service

The phone number, short code or alpha sender ID already exists in the Messaging Service.

• Multiple requests were made to add the phone number, short code or alpha sender ID to the Messaging Service's Sender Pool.
• The phone number, short code or alpha sender ID was already added at an earlier time.

• If you know this phone number is properly associated with the Messaging Service, do nothing.
• Remove the existing phone number, short code or alpha sender ID from the Messaging Service and add it back to the Messaging Service's Sender Pool.