If you have received a coupon code to register for Knit Camp, please keep in mind that the code can only be used via the web app here: https://knitcamp.oliveknits.com/ The App Store and Google Play store do not allow coupon codes. If you have difficulty using your code, please reach out to us at knitcampapp@oliveknits.com as we are unable to offer refunds if you complete the checkout process without the coupon code.