Hi got the same problem.
I using an imei and etc. changed galaxy s8 (it has benn changed to an s10+) . I can buy other things but when i try the ikonik it gets that error.
Eu nao recebi o ikoniko (im portuguese)
So recently bought S10 and I love it, however today I tried to claim the exclusive S10 fortnite skin but when I confirm my account details it says "in-app purchases denied" with "e100008/6050/.com.epicgames.fortnite" error message.
At first I thought, maybe this Is the app
so I tried putting money in normally and confirmed Samsung pay but I was denied again.
Why is this? And what should I do?