Duplicate Product Code

I got my message for my product code on 9/2/2021. Never really seen it until an email I got today and from there I checked here and got my steam code to activate, however upon activating, it shows the code is a duplicate product code and to contact the retailer. Nobody else has access to my account and its tied to 2fa via microsoft.

same thing for me idk what’s going on

Thats for season 8 Flighting of MCC, i did the same thing yesterday and panicked. Codes still havent gone out

No steam keys have been sent out for this flight yet, the key you are trying to use is for the old MCC flight which closed a few weeks ago. Despite being listed as active, this will not work for Halo Infinite.
Flight codes and access are still just over an house away from being live