diff --git a/app/controllers/submissions_preview_controller.rb b/app/controllers/submissions_preview_controller.rb
index d8a36f0b..40130e19 100644
--- a/app/controllers/submissions_preview_controller.rb
+++ b/app/controllers/submissions_preview_controller.rb
@@ -28,7 +28,7 @@ class SubmissionsPreviewController < ApplicationController
       raise ActionController::RoutingError, I18n.t('not_found')
     end
 
-    if !submission_valid_ttl?(@submission) && !signature_valid
+    if use_signature?(@submission) && !signature_valid
       Rollbar.info("TTL: #{@submission.id}") if defined?(Rollbar)
 
       return redirect_to submissions_preview_completed_path(@submission.slug)
@@ -48,9 +48,15 @@ class SubmissionsPreviewController < ApplicationController
 
   private
 
-  def submission_valid_ttl?(submission)
-    return true if current_user && current_user.account.submissions.exists?(id: submission.id)
+  def use_signature?(submission)
+    return false if current_user && can?(:read, submission)
+    return true if submission.submitters.any? { |e| e.preferences['require_phone_2fa'] }
+    return true if submission.template&.preferences&.dig('require_phone_2fa')
+
+    !submission_valid_ttl?(submission)
+  end
 
+  def submission_valid_ttl?(submission)
     last_submitter = submission.submitters.select(&:completed_at?).max_by(&:completed_at)
 
     last_submitter && last_submitter.completed_at > TTL.ago