Hi Dan. I tried installing version 2.8. On the ranking I checked "Unique Username" and the game still replies "409 Username already exist". The same response happens when I try your Demo! If I uncheck "Unique Username", the game registers two identical names for me. It appears that this update did not resolve the issue of unique identifiers being lost. I tried using both "player prefs" and "persistent data path", the problem remains. Thank you so much for your possible response and for what you created.
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Hey morgan1635!
Is this issue happening specifically on your leaderboard(s)? I have tested the demo scene with the demo leaderboard and could not see this issue occur. This could be an issue that is tied to your leaderboard, so if you could reach out to me via email with its public key I could investigate more.