I am unsure how to reproduce this bug, because it simply is that the notification "Exclamation Point (!)" will not disappear from the Decklists Page, specifically next to the Brawl Category.

  I am playing on both PC and Mobile (Android)

  I have completed the Tutorial twice, just to make sure I went through all the tips. I also tried the "Repair Game Files" option at least twice. I have played using a deck in the Brawl page, and that did not work either. The Exclamation Point does not go away and persists on both Mobile (Android) and PC platforms.

  The Exclamation Point (!) should not be there after completing the Tutorial.

  Screenshot attached.

  I have tried all I can think of and there does not seem to be a solution or workaround.