Devise, OmniAuth with Facebook, 'Not found. Authentication passthru'

Question

I'm trying to use Omniauth with Facebook for a project but whenever I try to log in with Facebook I get a blank page with just "Not found. Authentication passthru" written on it. I've tried all the solutions suggested here but none of them seem to work. I would be very grateful if you could try to help me, thank you in advance

app/controllers/users/omniauth_callbacks_controller.rb

    class Users::OmniauthCallbacksController < Devise::OmniauthCallbacksController
    def facebook
      @user = User.from_omniauth(request.env["omniauth.auth"]) 
     
      if @user.persisted?
        sign_in_and_redirect @user, :event => :authentication
        set_flash_message(:notice, :success, :kind => "Facebook") if is_navigational_format?
      else
        session["devise.facebook_data"] = request.env["omniauth.auth"]
        redirect_to new_user_registration_url
      end
    end
    
    def failure
      redirect_to root_path
    end
end

app/models/user.rb

class User < ApplicationRecord
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :validatable,
         :omniauthable, :omniauth_providers => [:facebook]

  def self.from_omniauth(auth)
    where(provider: auth.provider, uid: auth.uid).first_or_create do |user|
      user.email = auth.info.email
      user.password = Devise.friendly_token[0,20]
    end
  end
                
  def self.new_with_session(params, session)
    super.tap do |user|
      if data = session["devise.facebook_data"] && session["devise.facebook_data"]["extra"]["raw_info"]
        user.email = data["email"] if user.email.blank?
      end
    end
  end

  def facebook
    @user = User.from_omniauth(request.env["omniauth.auth"]) 
   
    if @user.persisted?
      sign_in_and_redirect @user, :event => :authentication
      set_flash_message(:notice, :success, :kind => "Facebook") if is_navigational_format?
    else
      session["devise.facebook_data"] = request.env["omniauth.auth"]
      redirect_to new_user_registration_url
    end
  end


end

app/views/users/sessions/new.html.erb

<h2>Log in</h2>

<%= form_for(resource, as: resource_name, url: session_path(resource_name)) do |f| %>
  <div class="field">
    <%= f.label :email %><br />
    <%= f.email_field :email, autofocus: true, autocomplete: "email" %>
  </div>

  <div class="field">
    <%= f.label :password %><br />
    <%= f.password_field :password, autocomplete: "current-password" %>
  </div>

  <div class="actions">
    <%= f.submit "Log in" %>
    <%= link_to "Sign in with Facebook", user_omniauth_authorize_path(:facebook) %>
  </div>

  <% if devise_mapping.rememberable? %>
    <div class="field">
      <%= f.check_box :remember_me %>
      <%= f.label :remember_me %>
    </div>
  <% end %>


<% end %>

<%= render "users/shared/links" %>

app/views/users/shared/_links.html.erb

<%- if controller_name != 'sessions' %>
  <%= link_to "Log in", new_session_path(resource_name) %><br />
<% end %>

<%- if devise_mapping.registerable? && controller_name != 'registrations' %>
  <%= link_to "Sign up", new_registration_path(resource_name) %><br />
<% end %>

<%- if devise_mapping.recoverable? && controller_name != 'passwords' && controller_name != 'registrations' %>
  <%= link_to "Forgot your password?", new_password_path(resource_name) %><br />
<% end %>

<%- if devise_mapping.confirmable? && controller_name != 'confirmations' %>
  <%= link_to "Didn't receive confirmation instructions?", new_confirmation_path(resource_name) %><br />
<% end %>

<%- if devise_mapping.lockable? && resource_class.unlock_strategy_enabled?(:email) && controller_name != 'unlocks' %>
  <%= link_to "Didn't receive unlock instructions?", new_unlock_path(resource_name) %><br />
<% end %>

<%- if devise_mapping.omniauthable? %>
  <%- resource_class.omniauth_providers.each do |provider| %>
    <%= link_to "Sign in with #{OmniAuth::Utils.camelize(provider)}", omniauth_authorize_path(resource_name, provider), method: :post %><br />
  <% end %>
<% end %>

config/routes.rb

Rails.application.routes.draw do
  devise_for :users, :controllers => { :omniauth_callbacks => "users/omniauth_callbacks" }

  root "gigs#index"

  resources :gigs
end

If it is of any help, this is what I get with rails routes:

                                  Prefix Verb     URI Pattern                                                                                       Controller#Action
                        new_user_session GET      /users/sign_in(.:format)                                                                          devise/sessions#new
                            user_session POST     /users/sign_in(.:format)                                                                          devise/sessions#create
                    destroy_user_session GET      /users/sign_out(.:format)                                                                         devise/sessions#destroy
        user_facebook_omniauth_authorize GET|POST /users/auth/facebook(.:format)                                                                    users/omniauth_callbacks#passthru
         user_facebook_omniauth_callback GET|POST /users/auth/facebook/callback(.:format)                                                           users/omniauth_callbacks#facebook
                       new_user_password GET      /users/password/new(.:format)                                                                     devise/passwords#new
                      edit_user_password GET      /users/password/edit(.:format)                                                                    devise/passwords#edit
                           user_password PATCH    /users/password(.:format)                                                                         devise/passwords#update
                                         PUT      /users/password(.:format)                                                                         devise/passwords#update
                                         POST     /users/password(.:format)                                                                         devise/passwords#create
                cancel_user_registration GET      /users/cancel(.:format)                                                                           devise/registrations#cancel
                   new_user_registration GET      /users/sign_up(.:format)                                                                          devise/registrations#new
                  edit_user_registration GET      /users/edit(.:format)                                                                             devise/registrations#edit
                       user_registration PATCH    /users(.:format)                                                                                  devise/registrations#update
                                         PUT      /users(.:format)                                                                                  devise/registrations#update
                                         DELETE   /users(.:format)                                                                                  devise/registrations#destroy
                                         POST     /users(.:format)                                                                                  devise/registrations#create
                                    root GET      /                                                                                                 gigs#index
                                    gigs GET      /gigs(.:format)                                                                                   gigs#index
                                         POST     /gigs(.:format)                                                                                   gigs#create
                                 new_gig GET      /gigs/new(.:format)                                                                               gigs#new
                                edit_gig GET      /gigs/:id/edit(.:format)                                                                          gigs#edit
                                     gig GET      /gigs/:id(.:format)                                                                               gigs#show
                                         PATCH    /gigs/:id(.:format)                                                                               gigs#update
                                         PUT      /gigs/:id(.:format)                                                                               gigs#update
                                         DELETE   /gigs/:id(.:format)                                                                               gigs#destroy
        turbo_recede_historical_location GET      /recede_historical_location(.:format)                                                             turbo/native/navigation#recede
        turbo_resume_historical_location GET      /resume_historical_location(.:format)                                                             turbo/native/navigation#resume
       turbo_refresh_historical_location GET      /refresh_historical_location(.:format)                                                            turbo/native/navigation#refresh
           rails_postmark_inbound_emails POST     /rails/action_mailbox/postmark/inbound_emails(.:format)                                           action_mailbox/ingresses/postmark/inbound_emails#create
              rails_relay_inbound_emails POST     /rails/action_mailbox/relay/inbound_emails(.:format)                                              action_mailbox/ingresses/relay/inbound_emails#create
           rails_sendgrid_inbound_emails POST     /rails/action_mailbox/sendgrid/inbound_emails(.:format)                                           action_mailbox/ingresses/sendgrid/inbound_emails#create
     rails_mandrill_inbound_health_check GET      /rails/action_mailbox/mandrill/inbound_emails(.:format)                                           action_mailbox/ingresses/mandrill/inbound_emails#health_check
           rails_mandrill_inbound_emails POST     /rails/action_mailbox/mandrill/inbound_emails(.:format)                                           action_mailbox/ingresses/mandrill/inbound_emails#create
            rails_mailgun_inbound_emails POST     /rails/action_mailbox/mailgun/inbound_emails/mime(.:format)                                       action_mailbox/ingresses/mailgun/inbound_emails#create
          rails_conductor_inbound_emails GET      /rails/conductor/action_mailbox/inbound_emails(.:format)                                          rails/conductor/action_mailbox/inbound_emails#index
                                         POST     /rails/conductor/action_mailbox/inbound_emails(.:format)                                          rails/conductor/action_mailbox/inbound_emails#create
       new_rails_conductor_inbound_email GET      /rails/conductor/action_mailbox/inbound_emails/new(.:format)                                      rails/conductor/action_mailbox/inbound_emails#new
      edit_rails_conductor_inbound_email GET      /rails/conductor/action_mailbox/inbound_emails/:id/edit(.:format)                                 rails/conductor/action_mailbox/inbound_emails#edit
           rails_conductor_inbound_email GET      /rails/conductor/action_mailbox/inbound_emails/:id(.:format)                                      rails/conductor/action_mailbox/inbound_emails#show
                                         PATCH    /rails/conductor/action_mailbox/inbound_emails/:id(.:format)                                      rails/conductor/action_mailbox/inbound_emails#update
                                         PUT      /rails/conductor/action_mailbox/inbound_emails/:id(.:format)                                      rails/conductor/action_mailbox/inbound_emails#update
                                         DELETE   /rails/conductor/action_mailbox/inbound_emails/:id(.:format)                                      rails/conductor/action_mailbox/inbound_emails#destroy
new_rails_conductor_inbound_email_source GET      /rails/conductor/action_mailbox/inbound_emails/sources/new(.:format)                              rails/conductor/action_mailbox/inbound_emails/sources#new
   rails_conductor_inbound_email_sources POST     /rails/conductor/action_mailbox/inbound_emails/sources(.:format)                                  rails/conductor/action_mailbox/inbound_emails/sources#create
   rails_conductor_inbound_email_reroute POST     /rails/conductor/action_mailbox/:inbound_email_id/reroute(.:format)                               rails/conductor/action_mailbox/reroutes#create
rails_conductor_inbound_email_incinerate POST     /rails/conductor/action_mailbox/:inbound_email_id/incinerate(.:format)                            rails/conductor/action_mailbox/incinerates#create
                      rails_service_blob GET      /rails/active_storage/blobs/redirect/:signed_id/*filename(.:format)                               active_storage/blobs/redirect#show
                rails_service_blob_proxy GET      /rails/active_storage/blobs/proxy/:signed_id/*filename(.:format)                                  active_storage/blobs/proxy#show
                                         GET      /rails/active_storage/blobs/:signed_id/*filename(.:format)                                        active_storage/blobs/redirect#show
               rails_blob_representation GET      /rails/active_storage/representations/redirect/:signed_blob_id/:variation_key/*filename(.:format) active_storage/representations/redirect#show
         rails_blob_representation_proxy GET      /rails/active_storage/representations/proxy/:signed_blob_id/:variation_key/*filename(.:format)    active_storage/representations/proxy#show
                                         GET      /rails/active_storage/representations/:signed_blob_id/:variation_key/*filename(.:format)          active_storage/representations/redirect#show
                      rails_disk_service GET      /rails/active_storage/disk/:encoded_key/*filename(.:format)                                       active_storage/disk#show
               update_rails_disk_service PUT      /rails/active_storage/disk/:encoded_token(.:format)                                               active_storage/disk#update
                    rails_direct_uploads POST     /rails/active_storage/direct_uploads(.:format)                                                    active_storage/direct_uploads#create