Can't claim Coin Reward

[Cece-2552]

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@GnomeSayin-11972

[Added 11/29] Some Collectible Coins for old expansions (Engineer’s Coin, Naxxramas Coin, Gallant Coin, Explorer’s Coin), are incorrectly visible in the Collection Manager. They’re still in-development and can’t be earned right now. They will be earnable once they are ready. The team is investigating a solution to their early appearance.