diff --git a/infrastructure/abri/abri_client.py b/infrastructure/abri/abri_client.py
index 4cfe51d7e..8ebd3ac2e 100644
--- a/infrastructure/abri/abri_client.py
+++ b/infrastructure/abri/abri_client.py
@@ -133,6 +133,11 @@ class AbriClient:
                 "AmendOptiAppt element missing from relay response"
             )
 
+        if amended.get("success") != "Y":
+            raise AbriResponseParseError(
+                "AmendOptiAppt element did not confirm success"
+            )
+
         job_no = amended.get("job_no")
         appointment_date = amended.get("appointment_date")
         appointment_time = amended.get("appointment_time")