I had been invited to play the flight but for some reason my steam key is saying it has already been used, does anyone else have this problem?
There is literally a hundred of these posts. No steam keys have been released yet. They will be in the email you receive via the waypoint email system.
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