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Works for me if I disable my ad blocker. You can also just use this link directly: https://www.gog.com/giveaway/claim
If you see an empty-looking JSON response, it's claimed. You can also refresh and it should tell you "Already claimed".
@rikudou interesting, I actually have uBlock Origin *disabled* on GOG, and even disabled Privacy Badger to see if this was the issue (and reloaded after it). Despite this I see lots of warnings in console about cookies not having the correct CORS setting, so it might just be an issue with the more recent versions of Firefox being more strict in this regard. That's a good workaround to know until GOG fixes their side, though, thanks.
Huh, weird, I just disabled my AdGuard and the link showed up. Well, glad I could help with the workaround!