Can't sign in using Supabase Auth with Next.js

As an app developer I want to enable Discord sign in so I can enable Discord sign in as an authentication method for my Next.js app.

My issue is that Supabase won't let me add a new user to the Auth database, nor can I sign in using the test user credentials I added to my own Supabase database table.

I am totally stuck with a Supbase database that I can't connect to using the create-next-app with-supabase template.
How do I fix this?
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