stop trying to use the promo with existing specials... n*ggas in here trying to get papa johns to pay them to deliver a pizza.
If that were the case the message would not say invalid but would rather point out the fact that you were trying to use the promotional code on an already discounted item. Some stores do not honor most of these promo codes because they are full of sh*t and the dumb a.ss Papa Johns website will only let you order from one store based on your address.
What makes this stupid a.ss situation even worse is that if I try to call the store it forces me to order from online they will not allow me to order over the phone and will instead direct me to another nearby store. I don't like that store though so last time they told me this I just went online and ordered so the first store would have to deliver. My cinnapie didn't have the extra icing I paid for and was overcooked. Last time I ordered Papa Johns period. There is way better local pizza anyways.