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In my application users can register an account normally (with username, email, password) or using Google or Facebook.

What message should be shown if a user is trying to login to my application with a username/email that is already taken by the provider (Google, Facebook)?

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    So are you treating an account created for a user via Google authentication (google:user@gmail.com) the same as an account created via email, with the same account (email:user@gmail.com)? In other words, would it solve your problem if you only evaluated conflicts within a chosen identification method (e.g. creating an account via Facebook would only check that the chosen FB profile is not already associated to an existing account)? – maxathousand May 1 '20 at 15:28
  • I did not understand the line: "if a user is trying to login to my application with a username/email that is already taken by the provider (Google, Facebook)". I think he can as you allow him to use google/facebook ? Please elaborate. – Moksh Sep 25 '20 at 14:26

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