Thanks for your reply. Apparently I didn't have diagnostics logging enabled and I have since published the app with all Authentication items in appsettings.json, so the app is actually working, but I'm concerned about the credentials that are in appsettings.json for the social login providers.
My question is: how to provide the credentials for each social login provider (Facebook, Twitter, Google, Microsoft) without keeping them in appsettings.json?
After reading through the links you provided, I'm still not clear on how to provide those credentials without using appsettings.json.
Thanks again for your time.