Title may be a little confusing, but the issue is for some reason, usually after closing out of classic WoW, when I go to the Hearthstone page on the app, the play button is greyed out and it tells me “This game requires you to log in to Battle net in order to play.”
… But I am logged in. The other games don’t give this issue. Closing the Battle net app and reopening it fixes it, so it’s not a huge problem, but I figured I would post about it just incase.