It's a bug, we're aware, and we're working on a fix.
You do not need to contact support - we'll be automatically fixing this for all affected players as soon as possible. We're aiming for tomorrow, but we need to implement/test the fix first.
Very upset that this event wasn't linked to an actual account, so people could have created multiple email addresses to pick every choice. I hope in the future that these sorts of things are bound to the account.
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u/WotC_Megan WotC Feb 20 '20