Hi.
I've heard that Discord does not support game registration when the game runs on the Vulkan API, yet when I play the Vulkan edition of Rainbow 6: Siege, it does show up in as an activity on my account, in Discord. The issue is, it does not show up as a program window that I can stream, from the usual bottom left corner of Discord.
After some searching, I wasn't able to find a concrete answer that explains why this happens. So this is me trying every location possible to find one.