diff --git a/app/components/dsfr/notice_component.rb b/app/components/dsfr/notice_component.rb
index 557f5a20e..44cae0b70 100644
--- a/app/components/dsfr/notice_component.rb
+++ b/app/components/dsfr/notice_component.rb
@@ -2,11 +2,18 @@
 class Dsfr::NoticeComponent < ApplicationComponent
   renders_one :title
 
-  def initialize(closable: false)
+  attr_reader :data_attributes
+
+  def initialize(closable: false, data_attributes: {})
     @closable = closable
+    @data_attributes = data_attributes
   end
 
   def closable?
     !!@closable
   end
+
+  def notice_data_attributes
+    { "data-dsfr-header-target": "notice" }.merge(data_attributes)
+  end
 end
diff --git a/app/components/dsfr/notice_component/notice_component.html.haml b/app/components/dsfr/notice_component/notice_component.html.haml
index 3ff0e4642..a99303599 100644
--- a/app/components/dsfr/notice_component/notice_component.html.haml
+++ b/app/components/dsfr/notice_component/notice_component.html.haml
@@ -1,4 +1,4 @@
-.fr-notice.fr-notice--info{ "data-dsfr-header-target": "notice" }
+.fr-notice.fr-notice--info{ **notice_data_attributes }
   .fr-container
     .fr-notice__body
       %p.fr-notice__title
diff --git a/app/components/switch_domain_banner_component.rb b/app/components/switch_domain_banner_component.rb
index 49104e4f6..b9bf0a2ef 100644
--- a/app/components/switch_domain_banner_component.rb
+++ b/app/components/switch_domain_banner_component.rb
@@ -9,8 +9,7 @@ class SwitchDomainBannerComponent < ApplicationComponent
 
   def render?
     return false unless helpers.switch_domain_enabled?(request)
-
-    # TODO if preferred hosts
+    return false if user&.preferred_domain_demarches_gouv_fr? && requested_from_new_domain?
 
     true
   end
@@ -27,6 +26,8 @@ class SwitchDomainBannerComponent < ApplicationComponent
     helpers.url_for(url_options)
   end
 
+  def requested_from_new_domain?
+    Current.host == ApplicationHelper::APP_HOST
   end
 
   private
diff --git a/app/components/switch_domain_banner_component/switch_domain_banner_component.html.haml b/app/components/switch_domain_banner_component/switch_domain_banner_component.html.haml
index 8a8f07136..efd5db5cb 100644
--- a/app/components/switch_domain_banner_component/switch_domain_banner_component.html.haml
+++ b/app/components/switch_domain_banner_component/switch_domain_banner_component.html.haml
@@ -8,7 +8,8 @@
       // TODO: notify us in order to monitor connectivity issues volume
     })
 
-= render Dsfr::NoticeComponent.new(closable: true) do |c|
+
+= render Dsfr::NoticeComponent.new(closable: true, data_attributes: { "data-switch-domain-notice" => true }) do |c|
   - c.with_title do
     = t(".message_new_domain")
     = "#{helpers.link_to APPLICATION_NAME, new_host_url}."
@@ -17,3 +18,10 @@
       = t(".follow_link")
     - elsif auto_switch? || true
       = t(".detected_error")
+
+- if user && !user.preferred_domain_demarches_gouv_fr? && requested_from_new_domain?
+  = form_tag(helpers.preferred_domain_path, method: :patch, remote: true, name: "update-preferred-domain")
+  :javascript
+    document.addEventListener('noticeClosed', function(e) {
+      document.forms['update-preferred-domain'].submit();
+    });
diff --git a/app/controllers/users/profil_controller.rb b/app/controllers/users/profil_controller.rb
index 2e039d025..ee2e90e27 100644
--- a/app/controllers/users/profil_controller.rb
+++ b/app/controllers/users/profil_controller.rb
@@ -63,6 +63,12 @@ module Users
       redirect_to profil_path
     end
 
+    def preferred_domain
+      current_user.update_preferred_domain(request.host_with_port)
+
+      head :no_content
+    end
+
     private
 
     def find_transfers
diff --git a/app/javascript/controllers/dsfr_header_controller.ts b/app/javascript/controllers/dsfr_header_controller.ts
index 7015ef29a..884b01f68 100644
--- a/app/javascript/controllers/dsfr_header_controller.ts
+++ b/app/javascript/controllers/dsfr_header_controller.ts
@@ -9,5 +9,8 @@ export class DSFRHeaderController extends ApplicationController {
     this.noticeTarget.parentNode?.removeChild(this.noticeTarget);
 
     this.element.classList.remove('fr-header__with-notice-info');
+
+    const event = new CustomEvent('noticeClosed', { bubbles: true });
+    this.element.dispatchEvent(event);
   }
 }
diff --git a/app/models/concerns/domain_migratable_concern.rb b/app/models/concerns/domain_migratable_concern.rb
index 181ca93c6..65be5f723 100644
--- a/app/models/concerns/domain_migratable_concern.rb
+++ b/app/models/concerns/domain_migratable_concern.rb
@@ -5,5 +5,14 @@ module DomainMigratableConcern
     enum preferred_domain: { demarches_gouv_fr: 0, demarches_simplifiees_fr: 1 }, _prefix: true
 
     validates :preferred_domain, inclusion: { in: User.preferred_domains.keys, allow_nil: true }
+
+    def update_preferred_domain(host)
+      case host
+      when ApplicationHelper::APP_HOST
+        preferred_domain_demarches_gouv_fr!
+      when ApplicationHelper::APP_HOST_LEGACY
+        preferred_domain_demarches_simplifiees_fr!
+      end
+    end
   end
 end
diff --git a/app/models/user.rb b/app/models/user.rb
index 19d829aec..955f8cd33 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -1,4 +1,5 @@
 class User < ApplicationRecord
+  include DomainMigratableConcern
   include EmailSanitizableConcern
   include PasswordComplexityConcern
 
diff --git a/config/routes.rb b/config/routes.rb
index 1ea777bb2..171fbc67c 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -386,6 +386,7 @@ Rails.application.routes.draw do
     post 'accept_merge' => 'profil#accept_merge'
     post 'refuse_merge' => 'profil#refuse_merge'
     delete 'france_connect_information' => 'profil#destroy_fci'
+    patch 'preferred_domain', to: 'profil#preferred_domain'
     get 'fermeture/:path', to: 'commencer#closing_details', as: :closing_details
   end