Alright, for everyone who has been struggling to get this going, I have a simple fix.
If you have already switched from native to jar, do that. You can do it by clicking your avatar in the top right and going to settings. Go to Minecraft, then scroll down and switch it.
Now make a folder, and you can name it anything. Now go the advanced install settings, and select this folder and press install. The problem was you never had a twitch folder to send minecraft too.
Hope this helped :) (also upvote this so people see it)