0_cust_churn_overview_dw.ipynb failed CI

Link to the notebook:
https://github.com/aws/amazon-sagemaker-examples/blob/master/use-cases/customer_churn/0_cust_churn_overview_dw.ipynb

Error:

---------------------------------------------------------------------------
Exception encountered at "In [3]":
---------------------------------------------------------------------------
UnknownServiceError Traceback (most recent call last)
in
----> 1 sagemaker_session = sagemaker.Session()
2 bucket = sagemaker_session.default_bucket() #replace with your own bucket name if you have one
3 s3 = sagemaker_session.boto_session.resource('s3')
4
5 region = boto3.Session().region_name

/opt/conda/lib/python3.7/site-packages/sagemaker/session.py in __init__(self, boto_session, sagemaker_client, sagemaker_runtime_client, sagemaker_featurestore_runtime_client, default_bucket)
124 sagemaker_client=sagemaker_client,
125 sagemaker_runtime_client=sagemaker_runtime_client,
--> 126 sagemaker_featurestore_runtime_client=sagemaker_featurestore_runtime_client,
127 )
128

/opt/conda

Open use-cases/customer_churn/0_cust_churn_overview_dw.ipynb and start with the failing In [3] cell, where sagemaker.Session() raises UnknownServiceError. Reproduce the CI failure and inspect the session initialization context. Done means the notebook completes its CI run without this error.

Written by the indexing model from the issue text.