That's right, as of this post, the Discord Game SDK has been officially deprecated, meaning that this mod can no longer create lobbies or control voice using the SDK, something that is obviously crucial for this mod to work.

One possible solution for this might be switching to use the Discord RPC (over IPC) to control player volumes, but this would be a complete overhaul of the entire mod.

I'm not giving up on the idea yet, but as of now, this mod will not work because of Discord's removal of the Game SDK features.

Read their docs with the removal notice here

Sorry for the necro, I looked again at this and couldn't find where it's gone. Unless I just skimmed over it entirely

Never mind. Looked on ReadME. Sorry for the necro