Some browsers are not supported to some websites. I suggest using Firefox as I know it works with redeeming red bull codes.
English
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The problem is that is used to work just fine and has deteriorated over time. Now it's at the point that the claim button won't work. But the sign in button works just fine. Something goes wrong after you sign in using your gaming network and it returns you to the website. I will just have to use a laptop PC next time.