Entering an incorrect survey code is a common mistake that can prevent access to the Longhorn survey menu questionnaire. Carefully compare every character on your receipt before typing it into the survey page. Pay close attention to numbers that look similar, such as 0 and O or 1 and I. If the code is rejected, recheck the receipt to confirm the information was entered correctly. Make sure the receipt has not expired and has not already been used for another survey. Avoid rushing through the process because small typing mistakes are often the cause of invalid code errors. Keeping the receipt clean and undamaged makes the printed information easier to read and reduces the likelihood of entering incorrect details.