diff --git a/sagemaker-core/src/sagemaker/core/transformer.py b/sagemaker-core/src/sagemaker/core/transformer.py
index 787978c8d6..d151689c61 100644
--- a/sagemaker-core/src/sagemaker/core/transformer.py
+++ b/sagemaker-core/src/sagemaker/core/transformer.py
@@ -779,8 +779,12 @@ def logs_for_transform_job(sagemaker_session, job_name, wait=False, poll=10):
         ValueError: If the transform job fails.
     """
 
+    # Describe through the session's (region-aware) client: TransformJob.get() expects a
+    # boto3 Session, and _logs_init/_check_job_status read the API's PascalCase keys.
     description = _wait_until(
-        lambda: TransformJob.get(transform_job_name=job_name, session=sagemaker_session).__dict__,
+        lambda: sagemaker_session.sagemaker_client.describe_transform_job(
+            TransformJobName=job_name
+        ),
         poll,
     )
 
@@ -830,8 +834,9 @@ def logs_for_transform_job(sagemaker_session, job_name, wait=False, poll=10):
         if state == LogState.JOB_COMPLETE:
             state = LogState.COMPLETE
         elif time.time() - last_describe_job_call >= 30:
-            transform_job = TransformJob.get(transform_job_name=job_name, session=sagemaker_session)
-            description = transform_job.__dict__ if transform_job else None
+            description = sagemaker_session.sagemaker_client.describe_transform_job(
+                TransformJobName=job_name
+            )
             last_describe_job_call = time.time()
 
             status = description["TransformJobStatus"]
diff --git a/sagemaker-core/tests/unit/test_transformer.py b/sagemaker-core/tests/unit/test_transformer.py
index e8c954ec71..c610b0547b 100644
--- a/sagemaker-core/tests/unit/test_transformer.py
+++ b/sagemaker-core/tests/unit/test_transformer.py
@@ -685,3 +685,27 @@ def test_transform_removes_tags_before_building_transform_job(self, mock_session
         call_kwargs = mock_transform_job_class.call_args[1]
         assert "tags" not in call_kwargs
         assert call_kwargs["transform_job_name"] == "test-job"
+
+
+@patch("sagemaker.core.transformer._flush_log_streams")
+@patch("sagemaker.core.transformer._logs_init")
+def test_logs_for_transform_job_describes_with_session_client(
+    mock_logs_init, mock_flush, mock_session
+):
+    """logs_for_transform_job describes the job through the session's region-aware client.
+
+    TransformJob.get() expects a boto3 Session (passing the SageMaker Session fails
+    validation), and _logs_init/_check_job_status read PascalCase describe keys.
+    """
+    from sagemaker.core.transformer import logs_for_transform_job
+
+    description = {"TransformJobName": "test-job", "TransformJobStatus": "Completed"}
+    mock_session.sagemaker_client.describe_transform_job.return_value = description
+    mock_logs_init.return_value = (1, [], {}, Mock(), "/aws/sagemaker/TransformJobs", False, Mock())
+
+    logs_for_transform_job(mock_session, "test-job", wait=True, poll=0)
+
+    mock_session.sagemaker_client.describe_transform_job.assert_called_with(
+        TransformJobName="test-job"
+    )
+    assert mock_logs_init.call_args[0][1] == description