It seems to be that a lot of stuff is down right now due to maintenance. My mailbox shows the same message and the market is down for maintenance as well. Unfortunately, nobody has any idea when the maintenance will be over since it was supposed to be finished yesterday with the launch of the Bonus Arcade Season. However, I do have faith that UR will still send all the messages that we meant to be sent after maintenance is over.
I'm just as frustrated as you are because I'm trying to get some more cards that can hopefully help me defeat the extremely tough Arcade mode.