diff --git a/spiffworkflow-backend/src/spiffworkflow_backend/routes/tasks_controller.py b/spiffworkflow-backend/src/spiffworkflow_backend/routes/tasks_controller.py
index 982dbb43..354b7591 100644
--- a/spiffworkflow-backend/src/spiffworkflow_backend/routes/tasks_controller.py
+++ b/spiffworkflow-backend/src/spiffworkflow_backend/routes/tasks_controller.py
@@ -807,7 +807,12 @@ def _task_submit_shared(
     if next_human_task_assigned_to_me:
         return make_response(jsonify(HumanTaskModel.to_task(next_human_task_assigned_to_me)), 200)
 
-    if "guestConfirmation" in spiff_task.task_spec.extensions:
+    spiff_task_extensions = spiff_task.task_spec.extensions
+    if (
+        "allowGuest" in spiff_task_extensions
+        and spiff_task_extensions["allowGuest"] == "true"
+        and "guestConfirmation" in spiff_task.task_spec.extensions
+    ):
         return make_response(
             jsonify({"guest_confirmation": spiff_task.task_spec.extensions["guestConfirmation"]}), 200
         )
diff --git a/spiffworkflow-frontend/src/routes/TaskShow.tsx b/spiffworkflow-frontend/src/routes/TaskShow.tsx
index 9850baa2..09973172 100644
--- a/spiffworkflow-frontend/src/routes/TaskShow.tsx
+++ b/spiffworkflow-frontend/src/routes/TaskShow.tsx
@@ -147,8 +147,12 @@ export default function TaskShow() {
     removeError();
     if (result.ok) {
       navigate(`/tasks`);
-    } else if (result.guest_confirmation) {
-      setGuestConfirmationText(result.guest_confirmation);
+    } else if ('guest_confirmation' in result) {
+      if (result.guest_confirmation) {
+        setGuestConfirmationText(result.guest_confirmation);
+      } else {
+        setGuestConfirmationText('Form submitted successfully');
+      }
     } else if (result.process_instance_id) {
       if (result.can_complete) {
         navigate(`/tasks/${result.process_instance_id}/${result.id}`);