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My username in the game is rekina, not sure how they would be able to find that, hope that it's ok

Had you mentioned that in your art submission post?

No I haven't, would you know who I can contact about this?

Oh... You can try the Splinterlands discord. Also, try posting a direct comment on this main post telling about your in game username. Don’t worry, you’ll get your prize. People here are really helpful.

Ok thanks I will try that