Typically, Duo SMS (text) code delays are due to poor cellular signal, Duo text service outages, and cell service outages. These issues typically resolve themselves on their own.
DO NOT try to send more text codes if the first few attempts do not go through. Repeated failed login attempts lead to account lockouts.
SMS codes are the most unreliable multifactor authentication method and pose other security risks. Duo SMS Codes are no longer supported for logins to NC State Services through Duo. You are required to set up a supported Duo login method.
If you need further assistance, you can contact the NC State Help Desk by submitting a request in the IT Service Portal or calling 919-515-4357 (HELP). You can also visit the OIT Walk-in Center.