Thou shall not poop in the camper shirt

I have a Thou shall not poop in the camper shirt 25 off 50 coupon but nowhere accepts it and it’s super frustrating doesn’t appear to work on the website and two stores now have said no there’s no phone on the coupon can someone please tell me where I can use this before it expires.
Source: Thou shall not poop in the camper shirt

Home page: https://unicornshirts.net/