"There was an error starting the match. Please try again in a few minutes."

When completing the second Grull challenge in the Ruins of Outland Challenge mode, when choosing a deck and launching it, there is an error saying “There was an error starting the match. Please try again in a few minutes.” The problem was not resolved after a few days.

i had the same Error msg.
but i dont know the reason, still here waiting for an hand.

ty in advance