I can't use the Steam key

I can’t use the Steam Key they give me to play MCC Season 8 Fligh. Steam says “Duplicate Product Code”

And when I try to see the details of the flight in “https://insidersupport.halowaypoint.com/hc/en-us” it just isn’t there.

Help

No steam codes have been released for this weekend’s flight. The code you are trying to use is for an older, closed flight - likely MCC Season 8.
The flight is on hold at the moment as 343 are dealing with a late-game technical issue. No codes or emails providing access to builds are likely to be sent until decisions have been made and updates posted. The flight may or may not be pushed out, a delay is not confirmed until 343 provide updates. An update is likely to come out in the AM, 343 time [PST] with further details.

Follow this topic for announcements as they arrive
https://www.halowaypoint.com/en-us/forums/243780d3b80b4bb6ac7917a8942286db/topics/psa-halo-technical-preview-2-updates/511173a1-85aa-4941-b02f-12645a4917ea/posts