diff --git a/app/views/users/webauthn_setup/new.html.erb b/app/views/users/webauthn_setup/new.html.erb
index b1e78fd3c74..716ca4a870b 100644
--- a/app/views/users/webauthn_setup/new.html.erb
+++ b/app/views/users/webauthn_setup/new.html.erb
@@ -14,7 +14,7 @@
 
 <%= simple_form_for(
       '',
-      url: webauthn_setup_path,
+      url: webauthn_setup_path(platform: @platform_authenticator.presence),
       method: :patch,
       html: {
         class: 'margin-top-4 margin-bottom-1',
diff --git a/spec/features/webauthn/management_spec.rb b/spec/features/webauthn/management_spec.rb
index 7436e257b1a..6b4fb55e552 100644
--- a/spec/features/webauthn/management_spec.rb
+++ b/spec/features/webauthn/management_spec.rb
@@ -169,6 +169,17 @@ def expect_webauthn_platform_setup_error
 
         expect(page).to have_current_path webauthn_setup_path(platform: true)
 
+        # Regression: LG-9860: Ensure that the platform URL parameter is maintained through reauthn
+        travel_to (IdentityConfig.store.reauthn_window + 1).seconds.from_now
+        fill_in_nickname_and_click_continue
+        mock_press_button_on_hardware_key_on_setup
+
+        expect(page).to have_current_path login_two_factor_options_path(reauthn: true)
+        click_on t('forms.buttons.continue')
+        fill_in_code_with_last_phone_otp
+        click_submit_default
+
+        expect(page).to have_current_path webauthn_setup_path(platform: true)
         fill_in_nickname_and_click_continue
         mock_press_button_on_hardware_key_on_setup