diff --git a/backend/pashub_fetcher/tests/test_pashub_service.py b/backend/pashub_fetcher/tests/test_pashub_service.py
index 44c6af1a..dd8ad0a8 100644
--- a/backend/pashub_fetcher/tests/test_pashub_service.py
+++ b/backend/pashub_fetcher/tests/test_pashub_service.py
@@ -257,6 +257,29 @@ def test_run_uses_coordination_client_when_pas_401_on_uprn_lookup() -> None:
     assert factory.call_count == 1
 
 
+def test_run_uses_coordination_client_when_pas_401_on_file_listing() -> None:
+    pas_client = MagicMock(spec=PashubClient)
+    pas_client.get_core_evidence_files_by_job_id.side_effect = UnauthorizedError()
+
+    coord_client = MagicMock(spec=PashubClient)
+    coord_client.get_core_evidence_files_by_job_id.return_value = ["/tmp/a.pdf"]
+
+    factory = MagicMock(return_value=coord_client)
+
+    service = make_service(pashub_client=pas_client, coordination_client_factory=factory)
+
+    with (
+        patch("backend.pashub_fetcher.pashub_service.upload_file_to_s3"),
+        patch("backend.pashub_fetcher.pashub_service.db_session"),
+        patch("backend.pashub_fetcher.pashub_service.os.remove"),
+    ):
+        result = service.run(make_request(uprn="12345"))
+
+    assert result == ["/tmp/a.pdf"]
+    coord_client.get_core_evidence_files_by_job_id.assert_called_once()
+    pas_client.get_uprn_by_job_id.assert_not_called()
+
+
 def test_run_warns_and_continues_when_site_notes_parsing_fails() -> None:
     mock_client = MagicMock(spec=PashubClient)
     mock_client.get_uprn_by_job_id.return_value = None