Due to a bug that was incorrectly displaying which cards had been opened in a player’s Sealed pool, the Arena Direct: EOE Play Booster (Sealed) event has been taken down, but will return later today.
According to the Wizards_Help Twitter account, players who have already paid their entry will receive refunds.
I’ve reached out to ask if anything will be done for the players who already won enough games to be eligible for prizes, but have not received a response as of this writing. I will update this article if that changes.