Discord Rich Presence does not work
Rich Presence only shows if you enable sharing of your detectd activities. Ensure that it is enabled.
Rich Presence will not work if Discord is installed as Administrator. If you see a User Account Control prompt (pictured below) every time you start Discord, then you have it installed as an Administrator. To fix this, reinstall Discord, making sure that you do not install it with Administrator permissions.
If you are using Vencord, check your plugins and ensure that you do not have the NoRPC plugin enabled.
If rich presence still is not working, then please open an issue.