OPI Code Invalid?

I received my code from the opi promo and have since entered it on waypoint and It says my code is invalid. I was just wondering if there is any solution other than just cutting my losses and returning the nail polish.

See this article on the Halo Support site, you may need to contact the issuer of the code.

https://support.halowaypoint.com/hc/en-us/articles/4408060543508-How-to-get-support-for-an-issue-with-an-in-game-purchase-or-code-in-Halo-Infinite