Overview

I tried authenticating Strapi using Auth0. I was able to accomplish this by following the steps in the article below.

Auth0 Provider and Strapi Tutorial

Learn the differences between Authentication, Authorization, and Access Control and implement authentication in Strapi using Auth0.

strapi.io

However, in the section specifying Allowed Callback URLs, I needed to change http://localhost:1337/connect/auth0/callback to http://localhost:1337/api/connect/auth0/callback.

(Reference) GitHub

Following the above steps as a reference, I was also able to successfully configure GitHub as a provider.