Discord is supported, but hasn’t been added to Console UI yet. In open source you’d set it up like this:
https://www.ory.sh/docs/kratos/guides/sign-in-with-github-google-facebook-linkedin#discord
If I’m not mistaken, through the CLI you could now enable this directly for your cloud project, with the only drawback that it won’t be shown in the UI (yet).
When it does get added, and you’ve configured it through the CLI, it will show up with your configuration automagically.