Firstly, it’s disgusting that Battlegrounds players can’t post in the Multiplayer forum unless you play regular hearthstone. The choices devs at Blizzard make on things like this always amaze me.
I need to report a duos teammate who tantrumed after I didn’t freeze a minion in my tavern, and spent the rest of the game spamming emotes, sold all of his minions, and didn’t play another minion. He clearly intentionally made us lose, yet there is no punishment for him, nor a way to report him. I have his name and screenshots.