Halo Infinite Flight 2 Duplicate code?

Having been invited to Flight 2 for Halo Infinite, upon attempting to input the code into steam, the code claims to be duplicate. I have never entered the code previously on the account and have no access to the Flight whatsoever. I can see multiple email messages and halo waypoint private messages directing me to this code, though it does not work whatsoever. I never redeemed the code for the flight and cannot understand how it could already have been inputted

343 are aware of issues with duplicate/invalid Steam keys and will be addressing this.

Please see my post here and follow that thread for further updates:
https://www.halowaypoint.com/en-us/forums/243780d3b80b4bb6ac7917a8942286db/topics/psa-halo-technical-preview-2-updates/511173a1-85aa-4941-b02f-12645a4917ea/posts?page=1#post6

<mark>For anyone dealing with the duplicate/invalid Steam code issue - please file a support ticket on the Insider Support Site:</mark>
https://insidersupport.halowaypoint.com/hc/en-us