Should we also change the priority order of provider usernames?

If we receive a preferred_username from the provider, we should probably prefer it over the name or nickname.

Thank you very much for your PR, and I apologize for the delayed response.

I think this change makes absolutely sense but there’s a potential issue with username conflicts since Pingvin Share supports multiple authentication methods. I would suggest attempting the sign-up with the provider’s username, and if it fails due to a conflict, we can then use the getAvailableUsername method to generate a unique username and proceed with the sign-up process. What do you think?

And yes, prioritizing preferred_username makes sense. I'm not sure why we prioritize the name and nickname.