diff --git a/ee/app/controllers/subscriptions/trials/duo_pro_controller.rb b/ee/app/controllers/subscriptions/trials/duo_pro_controller.rb
index f9c330256345dcf2ff9bb5ebd500f646a4f00c4d..0121dd2ac04d07e2c18ea15550e89dc51ebe3771 100644
--- a/ee/app/controllers/subscriptions/trials/duo_pro_controller.rb
+++ b/ee/app/controllers/subscriptions/trials/duo_pro_controller.rb
@@ -8,6 +8,7 @@ class DuoProController < ApplicationController
       include GoogleAnalyticsCSP
       include RegistrationsTracking
       include ::Gitlab::Utils::StrongMemoize
+      include SafeFormatHelper
 
       layout 'minimal'
 
@@ -39,6 +40,8 @@ def create
 
           track_event('duo_pro_trial_registration_success')
 
+          flash[:success] = success_flash_message
+
           redirect_to group_usage_quotas_path(@result.payload[:namespace], anchor: 'code-suggestions-usage-tab')
         elsif @result.reason == GitlabSubscriptions::Trials::CreateDuoProService::NO_SINGLE_NAMESPACE
           # lead created, but we now need to select namespace and then apply a trial
@@ -98,6 +101,19 @@ def lead_params
       def trial_params
         params.permit(:new_group_name, :namespace_id, :trial_entity, :glm_source, :glm_content).to_h
       end
+
+      def success_flash_message
+        safe_format(
+          s_(
+            'DuoProTrial|You have successfully created a trial subscription for GitLab Duo Pro. ' \
+            'It will expire on %{exp_date}.%{new_line}To get started, enable the GitLab Duo Pro ' \
+            'add-on for team members on this page by turning on the toggle for each team member. ' \
+            "The subscription may take a minute to sync, so refresh the page if it's not visible yet."
+          ),
+          exp_date: 30.days.from_now.strftime('%Y-%m-%d'),
+          new_line: '<br>'.html_safe
+        )
+      end
     end
   end
 end
diff --git a/ee/spec/requests/subscriptions/trials/duo_pro_controller_spec.rb b/ee/spec/requests/subscriptions/trials/duo_pro_controller_spec.rb
index ef0263d4c603642a675ea1d670d75a04eeb10e59..279e6379851c9508790eb3a56a23ad31e91537a2 100644
--- a/ee/spec/requests/subscriptions/trials/duo_pro_controller_spec.rb
+++ b/ee/spec/requests/subscriptions/trials/duo_pro_controller_spec.rb
@@ -153,6 +153,19 @@
           expect(post_create).to redirect_to(group_usage_quotas_path(group, anchor: 'code-suggestions-usage-tab'))
         end
 
+        it 'shows valid flash message' do
+          post_create
+
+          expect(flash[:success]).to include(
+            'You have successfully created a trial subscription for GitLab Duo Pro. It will expire on'
+          )
+
+          expect(flash[:success]).to include(
+            'To get started, enable the GitLab Duo Pro add-on for team members on this page by ' \
+            'turning on the toggle for each team member. The subscription may take a minute to sync'
+          )
+        end
+
         it_behaves_like 'with tracking trial registration', 'duo_pro_trial_registration_success'
       end
 
diff --git a/locale/gitlab.pot b/locale/gitlab.pot
index 2e9dfa1a2726460457cd976bdc06057599613ead..f88e6f89ead38ddda8f1e9eac581b1f1c014cffc 100644
--- a/locale/gitlab.pot
+++ b/locale/gitlab.pot
@@ -18873,6 +18873,9 @@ msgstr ""
 msgid "DuoProTrial|We just need some additional information to activate your trial."
 msgstr ""
 
+msgid "DuoProTrial|You have successfully created a trial subscription for GitLab Duo Pro. It will expire on %{exp_date}.%{new_line}To get started, enable the GitLab Duo Pro add-on for team members on this page by turning on the toggle for each team member. The subscription may take a minute to sync, so refresh the page if it's not visible yet."
+msgstr ""
+
 msgid "Duplicate page: A page with that title already exists in the file %{file}"
 msgstr ""