It worked for me, but of course I had to set the authorization endpoint in the settings back to https://indieauth.com/auth
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If you have the authorization endpoint set to the built-in one, then it would be kind of stuck in a weird state. Which brings me to another point. How do I know what the URL for the built-in authorization endpoint is? Right now if I change it to indieauth.com, then I have no way of knowing what to change it to to make it go back. Blanking out the value just stores a blank value which breaks it. Can you make it revert to the default built-in URL if a blank value is saved?