Why is it that I can't talk in fortnite in a match?

Bought a new Razer Kraken X USB, and it doesn't work anywhere except in Fortnite in the match. I can still speak perfectly in the spawn lobby, but not when I'm in the match.

Change the input (i.e. What the PC uses as a microphone) in the Fortnite settings

I've already done it, there's only standard and that from the headset and I've done that many times.