Steam Code Already Redeemed

I received a message in Halowaypoint about 4 hours ago regarding my Flight test for Halo Infinite, but when I went to go activate it in Steam I am getting a message saying it has already been redeemed by another Steam account. Is anyone else having this issue?

There was an issue with duplicate/invalid Steam keys earlier, resulting in codes having to be re-generated and published a few times. 343 have resolved this issue now and distributed new and working codes to everyone affected.

You can check for your new Steam key in one of these three places: