diff --git a/lambdas/mesh-acknowledge/mesh_acknowledge/acknowledger.py b/lambdas/mesh-acknowledge/mesh_acknowledge/acknowledger.py
index be12bbb35..24cade904 100644
--- a/lambdas/mesh-acknowledge/mesh_acknowledge/acknowledger.py
+++ b/lambdas/mesh-acknowledge/mesh_acknowledge/acknowledger.py
@@ -3,7 +3,7 @@
 import json
 from mesh_client import MeshClient
 
-NOTIFY_ACK_WORKFLOW_ID = "NHS_NOTIFY_SEND_REQUEST_ACK"
+NOTIFY_ACK_WORKFLOW_ID = "NHS_NOTIFY_FHIR_ACK"
 ACK_SUBJECT = "202"
 
 
diff --git a/tests/playwright/digital-letters-component-tests/mesh-acknowledge.component.spec.ts b/tests/playwright/digital-letters-component-tests/mesh-acknowledge.component.spec.ts
index 7d1050057..c069d1aa0 100644
--- a/tests/playwright/digital-letters-component-tests/mesh-acknowledge.component.spec.ts
+++ b/tests/playwright/digital-letters-component-tests/mesh-acknowledge.component.spec.ts
@@ -84,7 +84,7 @@ test.describe('Digital Letters - Mesh Acknowledger', () => {
       const messageHeaders = messageContent.metadata ?? {};
       expect(messageHeaders.subject).toEqual('202');
       expect(messageHeaders.local_id).toEqual(messageReference);
-      expect(messageHeaders.workflow_id).toEqual('NHS_NOTIFY_SEND_REQUEST_ACK');
+      expect(messageHeaders.workflow_id).toEqual('NHS_NOTIFY_FHIR_ACK');
 
       const messageBody = JSON.parse(messageContent.body);
       expect(messageBody).toEqual({