Tech Test Steam Key is a Dupe

I got my tech test invite yesterday, but only have been able to check it today since I’ve been busy. I was trying to activate the steam code but every time I enter the exact code in the message (I even copy pasted it), I just get a message saying that code has already been used. Is it possible for me to get a new one before the test ends or am I just -Yoinked!-? Where do I even go to get this fixed?

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: