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Some setup you must do manually if you haven't yet:
1. Ensure you have overridden or uncommented the routes for generated omniauth callback controllers in your routes.rb. For example: Rails.application.routes.draw do devise_for :users, controllers: { omniauth_callbacks: "users/omniauth_callbacks" } end 2. Update the devise twitter omniauth APP_ID and APP_SECRET in "config/initializers/devise.rb" after registering the Rails application on: https://developer.twitter.com/en/apps For example: config.omniauth :twitter, "APP_ID", "APP_SECRET" 3. Your omniauth callback URL will be: `<host>/users/auth/twitter/callback`. Please update callback URL in Twitter after registering your omniauth application.