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Some setup you must do manually if you haven't yet:

  Ensure you have overridden routes for generated controllers in your routes.rb.
  For example:

    Rails.application.routes.draw do
      notify_to :users,                       controller: 'users/notifications'
      notify_to :admins, with_devise: :users, controller: 'admins/notifications_with_devise'
    end

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