I’ve recently run into a Discord Hook Error when launching. I stopped Discord and relaunched the game and I was able to successfully launch the game. However, I would like to use Discord rather than turn it off so a resolution other than to turn it off was needed. When I had gone into the Blizzard game launcher settings and set the game launcher to close battle.net immediately when the game launches I was able to start the game with Discord side by side.
Then start Discord and then the game.