Keep only the FC logic and use devise for the rest

app/controllers/users/sessions_controller.rb

@@ -7,24 +7,15 @@ class Users::SessionsController < Devise::SessionsController
 
   before_action :restore_procedure_context, only: [:new, :create]
 
-  # GET /resource/sign_in
-  def new
-  end
-
   # POST /resource/sign_in
   def create
     user = User.find_by(email: params[:user][:email])
 
     if user&.valid_password?(params[:user][:password])
-      sign_in(user)
-      current_user.update(loged_in_with_france_connect: nil)
-
-      set_flash_message :notice, :signed_in
-      redirect_to after_sign_in_path_for(:user)
-    else
-      flash.alert = 'Mauvais couple login / mot de passe'
-      render :new, assigns: { user: User.new }
+      user.update(loged_in_with_france_connect: nil)
     end
+
+    super
   end
 
   def link_sent

spec/controllers/users/sessions_controller_spec.rb

@@ -61,7 +61,7 @@ describe Users::SessionsController, type: :controller do
         it 'redirects to new_path' do
           subject
 
-          expect(response).to redirect_to(new_user_session_path)
+          expect(response).to render_template(:new)
           expect(flash.alert).to eq(I18n.t('devise.failure.invalid'))
         end
       end