The Code Field can be rather picky on our registration page. It is best to not "copy & paste" the code into the field. If an extra space is accidentally added on either side of the code, the code will not work. We recommend typing in the code manually.
Another common reason the code does not work is that it is placed in a field that does not accept the code. The discount code should be entered during the third part of the registration process in the Registration Summary section of the online registration form as seen below. Underneath Billing Summary on this page, you will see a box that says "Enter Code" next to a button that says "Apply". Please enter the discount code in this box and then click "Apply". Please refer to the screenshot below: 