Summit coupon code

I have a summit coupon code that a moparts member was gratuitous enough to give to me. The problem I’m having is the Summitt checkout page is not accepting it. I’m also using the expiration date. Am I missing something or maybe I incorrectly copied the code?
Thanks

I just checked to see if I still had your pm and I’m sorry but I messed up. I forgot one number and have since threw that code out as I only keep them for a week. I have another one I will pm you. Sorry