Steam Code Already Redeemed

I have just received my code for the Halo Insider Flight today, when I try to activate it through Steam it is saying the code has already been redeemed. Is anyone able to help with this issue? I’ve seen some people saying it could be a code to an old flight, however this is the first flight I’ve signed up to and only received the code a couple if hours ago.

Any help is greatly appreciated!

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