Destiny 2 on (Steam) is having issues launching the game when you have the game in DOCK mode running on an external display. Some people believe is the anti cheat causing the crash at launch. The ONLY way to get around this is to set the monitor/TV in DUPLICATE screen or MIRROR screen, then launch the game. Once the game launches, open gamebar and change the monitor back to display on 2nd screen alone. I have to do this constantly every time i want to play in Dock mode using the XBOX Ally X.