diff --git a/app/forms/register_user_email_form.rb b/app/forms/register_user_email_form.rb
index 6aa1cb2046a..07afaf21bc2 100644
--- a/app/forms/register_user_email_form.rb
+++ b/app/forms/register_user_email_form.rb
@@ -170,7 +170,7 @@ def send_sign_up_confirmed_email
       )
     else
       UserMailer.with(user: existing_user, email_address: email_address_record).
-        signup_with_your_email.deliver_now_or_later
+        signup_with_your_email(request_id: request_id).deliver_now_or_later
     end
   end
 
diff --git a/app/mailers/user_mailer.rb b/app/mailers/user_mailer.rb
index 48790c362c1..6b742826e28 100644
--- a/app/mailers/user_mailer.rb
+++ b/app/mailers/user_mailer.rb
@@ -73,9 +73,9 @@ def email_confirmation_instructions(token, request_id:)
     end
   end
 
-  def signup_with_your_email
+  def signup_with_your_email(request_id:)
     with_user_locale(user) do
-      @root_url = root_url(locale: locale_url_param)
+      @root_url = root_url(locale: locale_url_param, request_id: request_id)
       mail(to: email_address.email, subject: t('mailer.email_reuse_notice.subject'))
     end
   end
diff --git a/spec/mailers/previews/user_mailer_preview.rb b/spec/mailers/previews/user_mailer_preview.rb
index 8acb83c15f6..64abf105d1a 100644
--- a/spec/mailers/previews/user_mailer_preview.rb
+++ b/spec/mailers/previews/user_mailer_preview.rb
@@ -8,7 +8,8 @@ def email_confirmation_instructions
   end
 
   def signup_with_your_email
-    UserMailer.with(user: user, email_address: email_address_record).signup_with_your_email
+    UserMailer.with(user: user, email_address: email_address_record).
+      signup_with_your_email(request_id: SecureRandom.uuid)
   end
 
   def reset_password_instructions
diff --git a/spec/mailers/user_mailer_spec.rb b/spec/mailers/user_mailer_spec.rb
index 4ec60f3f88a..61bad58336a 100644
--- a/spec/mailers/user_mailer_spec.rb
+++ b/spec/mailers/user_mailer_spec.rb
@@ -8,7 +8,11 @@
   let(:is_enhanced_ipp) { false }
 
   describe '#validate_user_and_email_address' do
-    let(:mail) { UserMailer.with(user: user, email_address: email_address).signup_with_your_email }
+    let(:request_id) { '1234-abcd' }
+    let(:mail) do
+      UserMailer.with(user: user, email_address: email_address).
+        signup_with_your_email(request_id: request_id)
+    end
 
     context 'with user and email address match' do
       it 'does not raise an error' do
@@ -210,8 +214,10 @@
   end
 
   describe '#signup_with_your_email' do
+    let(:request_id) { '1234-abcd' }
     let(:mail) do
-      UserMailer.with(user: user, email_address: user.email_addresses.first).signup_with_your_email
+      UserMailer.with(user: user, email_address: user.email_addresses.first).
+        signup_with_your_email(request_id: request_id)
     end
 
     it_behaves_like 'a system email'