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An error occurred while saving the commentSmeerpijp#17589 commented
I fixed it, I added redeemable codes to my account before actually playing the game - this made it so the starter deck had illegal cards or something. This made me unable to join a game and I got this annoying and extremely vague error. Anyway I removed all the cards in the starter deck of the color I was trying to play with and added random cards until it was valid. I found a match, conceded immediately and now I can actually play the game. Hope this helps.