Error message for multiple providers:When user is authenticated with Twitter, and then tries to log in with github with the same email address, they are taken to the default nextauth error page. It's not clear what the real error is - just says 'try with different provider', shiould say 'you have account with twitter with that email addr, log in with that one'
Don't allow email change: If a user has logged in with social provider , they shouldn't be allowed to change the email
Login works, but these are issues: