30018: Destination carrier requires sender ID pre-registration

You sent a message (message SID: SMXXXXX) to a mobile number in a country that requires Alphanumeric Sender ID pre-registration. Our records indicate that you do not have a registered Alphanumeric Sender ID for this country. This can result in lower delivery quality.

If you are sending transactional SMS (like OTP/auth codes, account-related alerts) you should pre-register for the best possible delivery quality.

• The recipient you are sending a message to is on a network that requires alphanumeric sender ID pre-registration, and our records indicate that your sender ID is not registered.

• Learn more about Alpha Sender ID registration requirements here.
• Contact support@twilio.com to register a sender ID for the destination country.