The Issue
I recently set up a forum with the standard account creation, and later decided I wanted to try OAuth only solutions.
After installing the third party login only extension, I realized I can't login to my admin panel anymore. I tried to remove both passport and the third party only extension, but I still can't login with my original admin information, and am redirected to the misconfigured passport login. I can no longer login to the admin panel at all now, despite removing these extensions.
I have already run php flarum cache:clear, reloaded nginx, and even rebooted the entire webserver since removing these extensions.