Rails SNS認証機能

問題点

deviseとomniauth-google-oauth2を使ったSNS認証機能を実装しているのですが、リンクの遷移先で
Not found. Authentication passthru.
と出てしまいます。

該当のソースコード

config/initializers/devise.rb

Devise.setup do |config|
 config.omniauth :google_oauth2,ENV['GOOGLE_CLIENT_ID'],ENV['GOOGLE_CLIENT_SECRET']

routes.rb

devise_for :customers,skip: [:passwords,], controllers: {
    omniauth_callbacks: 'customer/omniauth_callbacks',
    registrations: "customer/registrations",
    sessions: 'customer/sessions'
  }

controllers/customer/omniauth_callbacks_controller.rb

class Customer::OmniauthCallbacksController < Devise::OmniauthCallbacksController
  def google_oauth2
      # You need to implement the method below in your model (e.g. app/models/.rb)
      @customer = Customer.from_omniauth(request.env['omniauth.auth'])

      if @customer.persisted?
        flash[:notice] = I18n.t 'devise.omniauth_callbacks.success', kind: 'Google'
        sign_in_and_redirect @customer, event: :authentication
      else
        session['devise.google_data'] = request.env['omniauth.auth'].except(:extra) # Removing extra as it can overflow some session stores
        redirect_to new_customer_registration_url, alert: @customer.errors.full_messages.join("\n")
      end
  end
end

models/customer.rb

class Customer < ApplicationRecord
  
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :validatable, :omniauthable, omniauth_providers: [:google_oauth2]

def self.from_omniauth(access_token)
    data = access_token.info
    customer = Customer.where(email: data['email']).first

    # Uncomment the section below if you want customers to be created if they don't exist
    # unless customer
    #     customer = Customer.create(name: data['name'],
    #        email: data['email'],
    #        password: Devise.friendly_token[0,20]
    #     )
    # end
    customer
  end
end

schema.rb

create_table "customers", force: :cascade do |t|
    t.string "email", default: "", null: false
    t.string "encrypted_password", default: "", null: false
    t.string "reset_password_token"
    t.datetime "reset_password_sent_at"
    t.datetime "remember_created_at"
    t.string "last_name", null: false
    t.string "first_name", null: false
    t.string "last_name_kana", null: false
    t.string "first_name_kana", null: false
    t.boolean "is_deleted", default: false, null: false
    t.string "customer_image_id"
    t.datetime "created_at", null: false
    t.datetime "updated_at", null: false
    t.string "provider"
    t.string "uid"
    t.index ["email"], name: "index_customers_on_email", unique: true
    t.index ["reset_password_token"], name: "index_customers_on_reset_password_token", unique: true
  end

views/customer/registrations/new.html.erb

<%= link_to "Sign in with Google", customer_google_oauth2_omniauth_authorize_path %>

試したこと

https://qiita.com/bino98/items/596b5cffeca7c104bd90
https://qiita.com/akioneway94/items/35641ad30c2acb23b562
https://qiita.com/manbolila/items/8caa1f5d2b1fb96d2646
いくつかのサイトを参考にしながらやってみましたがダメでした…
正直動作の理解ができていないのでどこを修正するべきかも考えられていない状況です。
どなたかご教授いただけないでしょうか…